publicationDate stringlengths 10 10 | title stringlengths 17 233 | abstract stringlengths 20 3.22k | id stringlengths 9 12 |
|---|---|---|---|
2018-09-09 | Efficient thermionic operation and phonon isolation by a semiconductor-superconductor junction | Control of heat flux at small length scales is crucial for numerous
solid-state devices and systems. In addition to the thermal management of
information and communication devices the mastering of heat transfer channels
down to the nanoscale also enable, e.g., new memory concepts, high sensitivity
detectors and sensors... | 1809.02994v1 |
2018-11-02 | Conformal printing of graphene for single and multi-layered devices on to arbitrarily shaped 3D surfaces | Printing has drawn a lot of attention as a means of low per-unit cost and
high throughput patterning of graphene inks for scaled-up thin-form factor
device manufacturing. However, traditional printing processes require a flat
surface and are incapable of achieving patterning on to 3D objects. Here, we
present a conform... | 1811.01073v2 |
2018-11-12 | Homogeneous Large-area Quasi-freestanding Monolayer and Bilayer Graphene on SiC | In this study, we first show that the argon flow during epitaxial graphene
growth is an important parameter to control the quality of the buffer and the
graphene layer. Atomic force microscopy (AFM) and low-energy electron
diffraction (LEED) measurements reveal that the decomposition of the SiC
substrate strongly depen... | 1811.04998v1 |
2018-11-14 | Giant anisotropy in superconducting single crystals of CsCa$_2$Fe$_4$As$_4$F$_2$ | CsCa$_2$Fe$_4$As$_4$F$_2$ is a newly discovered iron-based superconductor
with $T_\mathrm{c}\sim$ 30 K containing double Fe$_2$As$_2$ layers that are
separated by insulating Ca$_2$F$_2$ spacer layers. Here we report the transport
and magnetization measurements on CsCa$_2$Fe$_4$As$_4$F$_2$ single crystals
grown for the ... | 1811.05706v1 |
2019-02-01 | Light Enhanced Blue Energy Generation using MoS$_2$ Nanopores | Blue energy relies on the chemical potential difference generated between
solutions of high and low ionic strength and would provide a sun-and-wind
independent energy source at estuaries around the world. Converting this
osmotic energy through reverse-electrodialysis relies on ion-selective
membranes. A novel generatio... | 1902.00410v1 |
2019-02-25 | Synaptic Learning and Memory Functions Achieved in Self-rectifying BFO Memristor under Extreme Environmental Temperature | Memristors have been intensively studied in recent years as promising
building blocks for next-generation non-volatile memory, artificial neural
networks and brain-inspired computing systems. Even though the environment
adaptability of memristor has been required in many application fields, it has
been rarely reported ... | 1902.09081v1 |
2019-07-03 | Probing defect states in few-layer MoS$_{2}$ by conductance fluctuation spectroscopy | Despite the concerted effort of several research groups, a detailed
experimental account of defect dynamics in high-quality single- and few-layer
transition metal dichalcogenides remain elusive. In this paper we report an
experimental study of the temperature dependence of conductance and
conductance-fluctuations on se... | 1907.01830v1 |
2020-04-11 | High-field depinned phase and planar Hall effect in skyrmion-host Gd$_2$PdSi$_3$ | For the skyrmion-hosting intermetallic Gd$_2$PdSi$_3$ with centrosymmetric
hexagonal lattice and triangular net of rare earth sites, we report a thorough
investigation of the magnetic phase diagram. Our work reveals a new magnetic
phase with isotropic value of the critical field for all orientations, where
the magnetic... | 2004.05385v1 |
2020-09-11 | Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx | Isoelectronic substitution is an ideal tuning parameter to alter electronic
states and correlations in iron-based superconductors. As this substitution
takes place outside the conducting Fe planes, the electronic behaviour is less
affected by the impurity scattering experimentally and relevant key electronic
parameters... | 2009.05523v1 |
2020-09-23 | Superconducting fluctuations in overdoped Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ | Fluctuating superconductivity - vestigial Cooper pairing in the resistive
state of a material - is usually associated with low dimensionality, strong
disorder or low carrier density. Here, we report single particle spectroscopic,
thermodynamic and magnetic evidence for persistent superconducting fluctuations
in heavily... | 2009.10932v2 |
2020-09-29 | Structural Phase Dependent Giant Interfacial Spin Transparency in W/CoFeB Thin Film Heterostructure | Pure spin current has transfigured the energy-efficient spintronic devices
and it has the salient characteristic of transport of the spin angular
momentum. Spin pumping is a potent method to generate pure spin current and for
its increased efficiency high effective spin-mixing conductance (Geff) and
interfacial spin tr... | 2009.14143v1 |
2017-04-20 | Accretion powered AGN feedback in the cores of galaxy clusters | Detection of the copious amount of X-ray emission from the dilute hot plasma
in galaxy clusters suggests that a substantial fraction of the central
intracluster medium (ICM) is cooling radiatively on a time scale much faster
than the Hubble time. Theoretical models predict the cooling rate as high as
about few hundred ... | 1704.06047v1 |
2017-04-23 | Steep-slope Hysteresis-free Negative Capacitance MoS2 Transistors | The so-called Boltzmann Tyranny defines the fundamental thermionic limit of
the subthreshold slope (SS) of a metal-oxide-semiconductor field-effect
transistor (MOSFET) at 60 mV/dec at room temperature and, therefore, precludes
the lowering of the supply voltage and the overall power consumption. Adding a
ferroelectric ... | 1704.06865v2 |
2017-08-04 | The cuprate phase diagram and the influence of nanoscale inhomogeneities | The phase diagram associated with the high Tc superconductors is complicated
by an array of different ground states. The parent material represents an
antiferromagnetic insulator but with doping superconductivity becomes possible
with transition temperatures previously thought unattainable. The underdoped
region of the... | 1708.01558v2 |
2019-03-12 | Precision Analysis of Evolved Stars | Evolved stars dominate galactic spectra, enrich the galactic medium, expand
to change their planetary systems, eject winds of a complex nature, produce
spectacular nebulae and illuminate them, and transfer material between binary
companions. While doing this, they fill the HR diagram with diagnostic loops
that write th... | 1903.05109v1 |
2019-04-14 | Superconducting Praseodymium Superhydrides | Superhydrides have complex hydrogenic sublattices and are important
prototypes for studying metallic hydrogen and high-temperature superconductors.
Encouraged by the results on LaH10, in consideration of the differences between
La and Pr, Pr-H system is especially worth studying because of the magnetism
and valence-ban... | 1904.06643v2 |
2019-08-06 | Hump-like structure in Hall signal from SrRuO$_3$ ultra-thin films without inhomogeneous anomalous Hall effect | A controversy arose over the interpretation of the recently observed hump
features in Hall resistivity $\rho_{xy}$ from ultra-thin SrRuO$_3$ (SRO) film;
it was initially interpreted to be due to topological Hall effect but was later
proposed to be from existence of regions with different anomalous Hall effect
(AHE). In... | 1908.02083v1 |
2019-08-22 | High-Pressure Synthesis of Magnetic Neodymium Polyhydrides | The current search for room-temperature superconductivity is inspired by the
unique properties of the electron-phonon interaction in metal superhydrides.
Encouraged by the recently found highest-$T_C$ superconductor fcc-$LaH_{10}$,
here we discover several superhydrides of another lanthanide - neodymium. We
identify th... | 1908.08304v3 |
2019-12-27 | Localized spin waves at low temperatures in a Cobalt Carbide nanocomposite | We study magnetic, transport and thermal properties of Cobalt carbide
nanocomposite with a mixture of Co2C and Co3C phases in 1:1 ratio, with an
average particle diameter of 40$\pm 15$ nm. We show that the behavior of the
nanocomposite is completely different from that of either Co3C or Co2C. We
observed that with decr... | 1912.12085v1 |
2012-06-06 | Irreversibility and time relaxation in electrostatic doping of oxide interfaces | Two-dimensional electron gas (2DEG) confined in quantum wells at insulating
oxide interfaces have attracted much attention as their electronic properties
display a rich physics with various electronics orders such as
superconductivity and magnetism. A particularly exciting features of these
hetero-structures lies in th... | 1206.1198v1 |
2018-07-04 | Doping effects of Cr on the physical properties of BaFe$_{1.9-x}$Ni$_{0.1}$Cr$_{x}$As$_{2}$ | We present a systematic study on the heavily Cr doped iron pnictides
BaFe$_{1.9-x}$Ni$_{0.1}$Cr$_{x}$As$_{2}$ by using elastic neutron scattering,
high-resolution synchrotron X-ray diffraction (XRD), resistivity and Hall
transport measurements. When the Cr concentration increases from $x=$ 0 to 0.8,
neutron diffraction... | 1807.01612v1 |
2018-07-26 | Excitation and coherent control of spin qudit modes with sub-MHz spectral resolution | Quantum bit or qubit is a two-level system, which builds the foundation for
quantum computation, simulation, communication and sensing. Quantum states of
higher dimension, i.e., qutrits (D = 3) and especially qudits (D = 4 or
higher), offer significant advantages. Particularly, they can provide
noise-resistant quantum ... | 1807.10383v1 |
2018-12-16 | Anti-fatigue-fracture hydrogels | The emerging applications of hydrogels in devices and machines require these
soft materials to maintain robustness under cyclic mechanical loads. Whereas
hydrogels have been made tough to resist fracture under a single cycle of
mechanical load, these toughened gels still suffer from fatigue fracture under
multiple cycl... | 1812.06403v1 |
2019-01-15 | Use of Cernox thermometers in AC specific heat measurements under pressure | We report on the resistance behavior of bare-chip Cernox thermometers under
pressures up to 2 GPa, generated in a piston-cylinder pressure cell. Our
results clearly show that Cernox thermometers, frequently used in
low-temperature experiments due to their high sensitivity, remain highly
sensitive even under applied pre... | 1901.05089v2 |
2019-10-07 | High electrical conductivity of single metal-organic chains | Molecular wires are essential components for future nanoscale electronics.
However, the preparation of individual long conductive molecules is still a
challenge. MMX metal-organic polymers are quasi-one-dimensional sequences of
single halide atoms (X) bridging subunits with two metal ions (MM) connected by
organic liga... | 1910.02834v1 |
2020-10-01 | Universal limiting transition temperature for the high $T_\mathrm{c}$ superconductors | Since their discovery three decades ago it has emerged that the physics of
high-$T_\mathrm{c}$ cuprate superconductors is characterised by multiple
temperature scales, and a phenomenology that deviates significantly from the
conventional paradigm of superconductivity. Below the "pseudogap" temperature,
$T^*$, a range o... | 2010.00572v1 |
2020-11-17 | Shallow Valence Band of Rutile GeO$_2$ and P-type Doping | GeO$_2$ has an $\alpha$-quartz-type crystal structure with a very wide
fundamental band gap of 6.6 eV and is a good insulator. Here we find that the
stable rutile-GeO$_2$ polymorph with a 4.6 eV band gap has a surprisingly low
$\sim$6.8 eV ionization potential, as predicted from the band alignment using
first-principle... | 2011.08928v1 |
2020-11-25 | Evidence for freezing of charge degrees of freedom across a critical point in CeCoIn$_5$ | The presence of a quantum critical point separating two distinct
zero-temperature phases is thought to underlie the `strange' metal state of
many high-temperature superconductors. The nature of this quantum critical
point, as well as a description of the resulting strange metal, are central
open problems in condensed m... | 2011.12951v1 |
2020-12-03 | Effect of ageing on the properties of the W-containing IRIS-TiAl alloy | The effects of ageing at 800 $^\circ$C on the properties of the IRIS alloy
(Ti$_{49.9}$Al$_{48}$W$_2$B$_{0.1}$) are studied. The initial microstructure of
this alloy densified by Spark Plasma Sintering (SPS) is mainly composed of
lamellar colonies which are surrounded by $\gamma$ grains. The evolutions of
the alloy str... | 2012.01760v1 |
2020-12-03 | First order transition in trigonal structure ${\textbf{Ca}}{\textbf{Mn}}_{2}{\textbf{P}}_{2}$ | We report structural and physical properties of the single crystalline
${\mathrm{Ca}}{\mathrm{Mn}}_{2}{\mathrm{P}}_{2}$. The X-ray diffraction(XRD)
results show that ${\mathrm{Ca}}{\mathrm{Mn}}_{2}{\mathrm{P}}_{2}$ adopts the
trigonal ${\mathrm{Ca}}{\mathrm{Al}}_{2}{\mathrm{Si}}_{2}$-type structure.
Temperature depende... | 2012.01863v1 |
2021-02-10 | Electropolishing of single crystal and polycrystalline aluminum to achieve high optical and mechanical surfaces | Electropolishing has found wide application as the final surface treatment of
metal products in mechanical engineering and instrumentation, medicine and
reflective concentrators for PV cells. It was found that electropolishing (EP)
not only reduces the surface roughness and changes its appearance, but improves
many ope... | 2102.05752v1 |
2021-04-21 | Electrically driven programmable phase-change meta-switch reaching 80% efficiency | Despite recent advances in active metaoptics, wide dynamic range combined
with high-speed reconfigurable solutions is still elusive. Phase-change
materials (PCMs) offer a compelling platform for metasurface optical elements,
owing to the large index contrast and fast yet stable phase transition
properties. Here, we exp... | 2104.10381v2 |
2021-07-01 | Solid Source Metal-Organic Molecular Beam Epitaxy of Epitaxial RuO2 | A seemingly simple oxide with a rutile structure, RuO2 has been shown to
possess several intriguing properties ranging from strain-stabilized
superconductivity to a strong catalytic activity. Much interest has arisen
surrounding the controlled synthesis of RuO2 films but, unfortunately,
utilizing atomically-controlled ... | 2107.00193v1 |
2021-08-02 | PID-like active control strategy for electroacoustic resonators to design tunable single-degree-of-freedom sound absorbers | Sound absorption at low frequencies still remains a challenge in both
scientific research and engineering practice. Natural porous materials are
ineffective in this frequency range, as well as acoustic resonators which
present too narrow bandwidth of absorption, thus requiring alternative
solutions based on active abso... | 2108.00765v1 |
2021-10-29 | Supercurrent diode effect and magnetochiral anisotropy in few-layer NbSe$_2$ | Nonreciprocal transport refers to charge transfer processes that are
sensitive to the bias polarity. Until recently, nonreciprocal transport was
studied only in dissipative systems, where the nonreciprocal quantity is the
resistance. Recent experiments have, however, demonstrated nonreciprocal
supercurrent leading to t... | 2110.15752v2 |
2021-11-28 | CoFeVSb: A Promising Candidate for Spin Valve and Thermoelectric Applications | We report a combined theoretical and experimental study of a novel quaternary
Heusler system CoFeVSb from the view point of room temperature spintronics and
thermoelectric applications. It crystallizes in cubic structure with small
DO$_3$-type disorder. The presence of disorder is confirmed by room temperature
synchrot... | 2111.14081v1 |
2021-12-16 | Constrained multi-objective optimization of process design parameters in settings with scarce data: an application to adhesive bonding | Adhesive joints are increasingly used in industry for a wide variety of
applications because of their favorable characteristics such as high
strength-to-weight ratio, design flexibility, limited stress concentrations,
planar force transfer, good damage tolerance, and fatigue resistance. Finding
the optimal process para... | 2112.08760v3 |
2022-01-08 | Are Heavy Fermion Strange Metals Planckian? | Strange metal behavior refers to a linear temperature dependence of the
electrical resistivity at temperatures below the Mott-Ioffe-Regel limit. It is
seen in numerous strongly correlated electron systems, from the heavy fermion
compounds, via transition metal oxides and iron pnictides, to magic angle
twisted bi-layer ... | 2201.02820v1 |
2022-03-04 | Character of the "normal state" of the nickelate superconductors | The occurrence of superconductivity in proximity to various strongly
correlated phases of matter has drawn extensive focus on their normal state
properties, to develop an understanding of the state from which
superconductivity emerges. The recent finding of superconductivity in layered
nickelates raises similar interes... | 2203.02580v1 |
2022-03-22 | Prediction of resistance induced by surface complexity in lubricating layers: Application to super-hydrophobic surfaces | Super Hydrophobic (SH) coatings are widely used to mitigate drag in various
applications. Numerous studies have demonstrated that the beneficial wall-slip
effect produced by these materials disappears in laminar flow regimes. The main
mechanisms considered to be behind the decrease in performance are
Marangoni-induced ... | 2203.12039v1 |
2022-04-06 | Thermal activation of low-density Ga implanted in Ge | The nuclear spins of low-density implanted Ga atoms in Ge are interesting
candidates for solid state-based qubits. To date, activation studies of
implanted Ga in Ge have focused on high densities. Here we extend activation
studies into the low-density regime. We use spreading resistance profiling and
secondary ion mass... | 2204.02878v1 |
2022-05-05 | Intrinsic spin Hall torque in a moire Chern magnet | In spin torque magnetic memories, electrically actuated spin currents are
used to switch a magnetic bit. Typically, these require a multilayer geometry
including both a free ferromagnetic layer and a second layer providing spin
injection. For example, spin may be injected by a nonmagnetic layer exhibiting
a large spin ... | 2205.02823v1 |
2022-06-02 | A multi-fidelity approach coupling parameter space reduction and non-intrusive POD with application to structural optimization of passenger ship hulls | Nowadays, the shipbuilding industry is facing a radical change towards
solutions with a smaller environmental impact. This can be achieved with low
emissions engines, optimized shape designs with lower wave resistance and noise
generation, and by reducing the metal raw materials used during the
manufacturing. This work... | 2206.01243v3 |
2022-06-08 | Dielectric properties and impedance spectroscopy of NASICON type Na$_3$Zr$_2$Si$_2$PO$_{12}$ | We report the temperature dependent dielectric properties and impedance
spectroscopy investigation of Na$_3$Zr$_2$Si$_2$PO$_{12}$ in the frequency
range of 20 Hz--2 MHz. The Rietveld refinement of x-ray diffraction pattern
confirms the monoclinic phase with C2/c space group. The {\it d.c.} resistivity
behavior shows it... | 2206.03668v1 |
2022-11-18 | Synthesis of infinite-layer nickelates and influence of the capping-layer on magnetotransport | The recent discovery of a zero-resistance state in nickel-based compounds has
generated a re-excitement about the long-standing problem in condensed matter
of high-critical-temperature superconductivity, in light of the analogies
between infinite-layer nickelates and cuprates. However, despite some formal
valence and c... | 2211.10251v1 |
2022-12-12 | Unconventional localization of electrons inside of a nematic electronic phase | The magnetotransport behaviour inside the nematic phase of bulk FeSe reveals
unusual multiband effects that cannot be reconciled with a simple two-band
approximation proposed by surface-sensitive spectroscopic probes. In order to
understand the role played by the multiband electronic structure and the degree
of two-dim... | 2212.06196v1 |
2023-01-19 | Ab initio comparison of spin-transport properties in MgO-spaced ferrimagnetic tunnel junctions based on Mn$_3$Ga and Mn$_3$Al | We report on first-principles spin-polarised quantum transport calculations
(from NEGF+DFT) in MgO-spaced magnetic tunnel junctions (MTJs) based on two
different Mn-based Heusler ferrimagnetic metals, namely Mn$_3$Al and Mn$_3$Ga
in their tetragonal DO$_{22}$ phase. The former is a fully compensated
half-metallic ferri... | 2301.08300v1 |
2023-05-09 | Influence of Shape on Heteroaggregation of Model Microplastics: A Simulation Study | Nano- and microplastics are a growing threat for the environment, especially
in aqueous habitats. For assessing the influence on the ecosystem and possible
solution strategies, it is necessary to investigate the fate of microplastics
(MP) in the environment. MPs are typically surrounded by natural organic
matter, which... | 2305.05453v1 |
2023-06-08 | Epitaxial thin films of binary Eu-compounds close to a valence transition | Intermetallic binary compounds of europium reveal a variety of interesting
phenomena due to the interconnection between two different magnetic and 4f
electronic (valence) states, which are particularly close in energy. The
valence states or magnetic properties are thus particularly sensitive to
strain-tuning in these m... | 2306.05355v2 |
2023-06-26 | Phase purity and surface morphology of high-Jc superconducting Bi2Sr2Ca1Cu2O8+δ thin films | Bi2Sr2Ca1Cu2O8+d (Bi-2212) thin films with thicknesses less than 50 nm (<20
unit cells) are grown by pulsed laser deposition (PLD) onto (001) LaAlO3 (LAO)
single crystal substrates. Phase-pure and smooth c-axis oriented Bi-2212 films
with optimal oxygen doping, critical temperature Tc0 up to 86 K, and critical
current ... | 2306.14481v1 |
2023-07-12 | Coexistence of Competing Microbial Strains under Twofold Environmental Variability and Demographic Fluctuations | Microbial populations generally evolve in volatile environments, under
conditions fluctuating between harsh and mild, e.g. as the result of sudden
changes in toxin concentration or nutrient abundance. Environmental variability
thus shapes the long-time population dynamics, notably by influencing the
ability of differen... | 2307.06314v3 |
2023-07-31 | Synthesis of possible room temperature superconductor LK-99:Pb$_9$Cu(PO$_4$)$_6$O | The quest for room-temperature superconductors has been teasing scientists
and physicists, since its inception in 1911 itself. Several assertions have
already been made about room temperature superconductivity but were never
verified or reproduced across the labs. The cuprates were the earliest high
transition temperat... | 2307.16402v2 |
2023-10-11 | Temperature-Dependent Collective Excitations in a Three-Dimensional Dirac System ZrTe$_{5}$ | Zirconium pentatelluride (ZrTe$_{5}$), a system with a Dirac linear band
across the Fermi level and anomalous transport features, has attracted
considerable research interest for it is predicted to be located at the
boundary between strong and weak topological insulators separated by a
topological semimetal phase. Howe... | 2310.07232v2 |
2023-10-19 | Comparison of the Resistivities of Nanostructured Films Made from Silver, Copper-Silver and Copper Nanoparticle and Nanowire Suspensions | Spray deposition and inkjet printing of various nanostructures are emerging
complementary methods for creating conductive coatings on different substrates.
In comparison to established deposition techniques like vacuum metal coating
and lithography-based metallization processes, spray deposition and inkjet
printing ben... | 2310.12506v1 |
2023-11-01 | Active Noise Control Portable Device Design | While our world is filled with its own natural sounds that we can't resist
enjoying, it is also chock-full of other sounds that can be irritating, this is
noise. Noise not only influences the working efficiency but also the human's
health. The problem of reducing noise is one of great importance and great
difficulty. T... | 2311.00535v1 |
2023-11-13 | Superconductivity in trilayer nickelate La4Ni3O10 under pressure | Nickelate superconductors have attracted a great deal of attention over the
past few decades due to their similar crystal and electronic structures with
high-temperature cuprate superconductors. Here, we report the superconductivity
in a pressurized Ruddlesden-Popper phase single crystal, La4Ni3O10 (n = 3), and
its int... | 2311.07423v2 |
2023-11-15 | Quantification of cell contractile behavior based on non-destructive macroscopic measurement of tension forces on bioprinted hydrogel | Contraction assay based on surface measurement have been widely used to
evaluate cell contractility in 3D models. This method is straightforward and
requires no specific equipment, but it does not provide quantitative data about
contraction forces generated by cells. We expanded this method with a new
biomechanical mod... | 2311.08773v1 |
2023-12-15 | Plasma-enhanced atomic layer deposition of titanium nitride for superconducting devices | This study presents a comprehensive investigation into the exceptional
superconducting attributes of titanium nitride (TiN) achieved through
plasma-enhanced atomic layer deposition (PEALD) on both planar and intricate
three-dimensional (3D) structures. We introduced an additional substrate
biasing cycle to densify the ... | 2312.09984v1 |
2023-12-19 | On the role of Grain Boundary Character in the Stress Corrosion Cracking of Nanoporous Gold Thin Films | For its potential as a catalyst, nanoporous gold (NPG) prepared through
dealloying of bulk Ag-Au alloys has been extensively investigated. NPG thin
films can offer ease of handling, better tunability of the chemistry and
microstructure of the nanoporous structure, and represent a more sustainable
usage of scarce resour... | 2312.12235v1 |
2024-02-26 | Electronic phase transitions and superconductivity in ferroelectric Sn$_2$P$_2$Se$_6$ under pressure | Since there is both strong electron-phonon coupling during a ferroelectric/FE
transition and superconducting/SC transition, it has been an important topic to
explore superconductivity from the FE instability. Sn$_2$P$_2$Se$_6$ arouses
broad attention due to its unique FE properties. Here, we reported the
electronic pha... | 2402.16427v1 |
2024-02-29 | Anomalous frequency and temperature dependent scattering in the dilute metallic phase in lightly doped-SrTiO$_3$ | The mechanism of superconductivity in materials with aborted ferroelectricity
and the emergence of a dilute metallic phase in systems like doped-SrTiO$_3$
are outstanding issues in condensed matter physics. This dilute metal has
features both similar and different to those found in the normal state of other
unconventio... | 2402.18767v1 |
2024-03-06 | Crystal, ferromagnetism, and magnetoresistance with sign reversal in a EuAgP semiconductor | We synthesized the ferromagnetic EuAgP semiconductor and conducted a
comprehensive study of its crystalline, magnetic, heat capacity, band gap, and
magnetoresistance properties. Our investigation utilized a combination of X-ray
diffraction, optical, and PPMS DynaCool measurements. EuAgP adopts a hexagonal
structure wit... | 2403.03650v1 |
2024-03-20 | Optimizing Transparent Electrodes: Interplay of High Purity SWCNTs network and a Polymer | The discovery of transparent electrodes led to the development of
optoelectronic devices such as OLEDs, LCDs, touchscreens, IR sensors, etc.
Since ITO has many drawbacks in respect of its production cost and limited
transparency in IR, carbon nanotubes (CNTs) have been a potential replacement
for ITO due to their excep... | 2403.13594v1 |
1996-10-01 | Itinerant Antiferromagnetism in FeGe_2 | FeGe_2, and lightly doped compounds based on it, have a Fermi surface driven
instability which drive them into an incommensurate spin density wave state.
Studies of the temperature and magnetic field dependence of the resistivity
have been used to determine the magnetic phase diagram of the pure material
which displays... | 9610009v1 |
1998-05-25 | Metal-insulator transition induced by 16O -18O oxygen isotope exchange in colossal negative magnetoresistance manganites | The effect of 16O-18O isotope exchange on the electric resistivity was
studied for (La(1-y)Pr(y))0.7Ca0.3MnO3 ceramic samples. Depending on y, this
mixed perovskite exhibited different types of low-temperature behavior ranging
from ferromagnetic metal (FM) to charge ordered (CO) antiferromagnetic
insulator. It was foun... | 9805315v1 |
2001-04-13 | Metal-insulator transition in 2D: a role of the upper Habbard band | To explain the main features of the metal-insulator transition (MIT) in 2D we
suggest a simple model taking into account strongly localized states in the
band tail of 2D conductivity band with a specific emphasize of a role of
doubly-occupied states (upper Hubbard band). The metallic behavior of
resistance is explained... | 0104254v1 |
2001-05-31 | Anomalous Nonlinear Microwave Response of Epitaxial YBa2Cu3O7-x Films on MgO | We have investigated the anomalous nonlinear microwave response of epitaxial
electron-beam coevaporated YBa2Cu3O7-x films on MgO. The power and temperature
dependent surface impedance and two-tone intermodulation distortion were
measured in stripline resonators at several frequencies between 2.3 and 11.2
GHz and at tem... | 0105613v1 |
2002-01-25 | The influence of microstructures and crystalline defects on the superconductivity of MgB2 | This work studies the influence of microstructures and crystalline defects on
the superconductivity of MgB2, with the objective to improve its flux pinning.
A MgB2 sample pellet that was hot isostatic pressed (HIPed) was found to have
significantly increased critical current density (Jc) at high fields than its
un-HIPe... | 0201486v2 |
2004-04-19 | Low temperature transport in granular metals | We investigate transport in a granular metallic system at large tunneling
conductance between the grains. We show that at low temperatures, $T\leq
g_T\delta $, where $\delta$ is the single mean energy level spacing in a grain,
the coherent electron motion at large distances dominates the physics, contrary
to the high t... | 0404443v2 |
2004-10-21 | Novel magnetic behavior of single crystalline Er2PdSi3 | We report the results of ac and dc magnetic susceptibility (chi) and
electrical resistivity (rho) measurements on the single crystals of Er2PdSi3,
crystallizing in an AlB2-derived hexagonal structure, for two orientations
H//[0001] and H//[2 -1 -1 0]. For H//[0001], there are apparently two magnetic
transitions as reve... | 0410532v1 |
2006-06-22 | Metal-insulator transition in Nd$_{1-x}$Eu$_{x}$NiO$_{3}$ compounds | Polycrystalline Nd$_{1-x}$Eu$_{x}$NiO$_3$ ($0 \leq x \leq 0.5$) compounds
were synthesized in order to investigate the character of the metal-insulator
(MI) phase transition in this series. Samples were prepared through the sol-gel
route and subjected to heat treatments at $\sim$1000 $^\circ$C under oxygen
pressures as... | 0606573v1 |
2007-03-21 | Dynamics of the Magnetic Flux Trapped in Fractal Clusters of a Normal Phase in Percolative Superconductors | The effect of the fractal clusters of a normal phase, which act as pinning
centers, on the dynamics of magnetic flux in percolative type-II superconductor
is considered. The main features of these clusters are studied in detail: the
cluster statistics is analyzed; the fractal dimension of their boundary is
estimated; t... | 0703541v1 |
2007-03-27 | Diffusion and activation of n-type dopants in germanium | The diffusion and activation of $n$-type impurities (P and As) implanted into
$p$-type Ge(100) substrates were examined under various dose and annealing
conditions. The secondary ion mass spectrometry profiles of chemical
concentrations indicated the existence of a sufficiently high number of
impurities with increasing... | 0703708v3 |
2008-10-14 | Superconductivity in Fluorine-Arsenide Sr_{1-x}La_xFeAsF | Since the discovery of superconductivity\cite{1} at 26 K in oxy-pnictide
$LaFeAsO_{1-x}F_x$, enormous interests have been stimulated in the fields of
condensed matter physics and material sciences. Among the five different
structures in this broad type of superconductors\cite{2,3,4,5,6}, the ZrCuSiAs
structure has rece... | 0810.2531v3 |
2009-07-09 | Annular Spin-Transfer Memory Element | An annular magnetic memory that uses a spin-polarized current to switch the
magnetization direction or helicity of a magnetic region is proposed. The
device has magnetic materials in the shape of a ring (1 to 5 nm in thickness,
20 to 250 nm in mean radius and 8 to 100 nm in width), comprising a reference
magnetic layer... | 0907.1600v1 |
2009-09-16 | Band structure engineering of epitaxial graphene on SiC by molecular doping | Epitaxial graphene on SiC(0001) suffers from strong intrinsic n-type doping.
We demonstrate that the excess negative charge can be fully compensated by
non-covalently functionalizing graphene with the strong electron acceptor
tetrafluorotetracyanoquinodimethane (F4-TCNQ). Charge neutrality can be reached
in monolayer g... | 0909.2966v2 |
2010-01-07 | Anisotropic Connectivity and its Influence on Critical Current Densities, Irreversibility Fields, and Flux Creep in In-Situ-Processed MgB2 Strands | The anisotropy of the critical current density (Jc) and its influence on
measurement of irreversibility field (Birr) has been investigated for high
quality, in-situ MgB2 strands. Comparison of transport and magnetization
measurements has revealed the onset of a regime where large differences exist
between transport and... | 1001.1030v1 |
2010-04-21 | Determination of the intrinsic ferroelectric polarization in orthorhombic HoMnO3 | Whether large ferroelectric polarization P exists in the orthorhombic HoMnO3
with the E-type antiferromagnetic spin ordering or not remains as one of
unresolved, challenging issues in the physics of multiferroics. The issue is
closely linked to an intriguing experimental difficulty for determining P of
polycrystalline ... | 1004.3643v1 |
2010-07-26 | Python Regius (Ball Python) shed skin: Biomimetic analogue for function-targeted design of tribo-surfaces | A major concern in designing tribo-systems is to minimize friction, save
energy, and to reduce wear. Satisfying these requirements depends on the
integrity of the rubbing surface and its suitability to sliding conditions. As
such, designers currently focus on constructing surfaces that are an integral
part of the funct... | 1007.4419v1 |
2010-11-09 | Phase diagram of iron-arsenide superconductors Ca(Fe1-xCox)2As2 (0 <= x <= 0.2) | Platelet-like single crystals of the Ca(Fe1-xCox)2As2 series having lateral
dimensions up to 15 mm and thickness up to 0.5 mm were obtained from the high
temperature solution growth technique using Sn flux. Upon Co doping, the c-axis
of the tetragonal unit cell decreases, while the a-axis shows a less
significant varia... | 1011.2085v1 |
2011-08-17 | Impact of Protostellar Outflow on Star Formation: Effects of Initial Cloud Mass | Star formation efficiency controlled by the protostellar outflow in a single
cloud core is investigated by three-dimensional resistive MHD simulations.
Starting from the prestellar cloud core, the star formation process is
calculated until the end of the main accretion phase. In the calculations, the
mass of the preste... | 1108.3564v1 |
2012-05-02 | Negative thermal expansion and antiferromagnetism in the actinide oxypnictide NpFeAsO | A neptunium analogue of the LaFeAsO tetragonal layered compound has been
synthesized and characterized by a variety of experimental techniques. The
occurrence of long-range magnetic order below a critical temperature T_N = 57 K
is suggested by anomalies in the temperature-dependent magnetic susceptibility,
electrical r... | 1205.0438v1 |
2012-09-13 | Magnetic phase transitions in single crystals of the chiral helimagnet Cr1/3NbS2 | The chiral helimagnet Cr1/3NbS2 has been investigated by magnetic, transport
and thermal properties measurements on single crystals and by first principles
electronic structure calculations. From the measured field and temperature
dependence of the magnetization for fields applied perpendicular to the c axis,
the magne... | 1209.2783v1 |
2013-04-15 | Non-Fermi liquids and the Wiedemann-Franz law | A general discussion of the ratio of thermal and electrical conductivities in
non-Fermi liquid metals is given. In metals with sharp Drude peaks, the
relevant physics is correctly organized around the slow relaxation of
almost-conserved momenta. While in Fermi liquids both currents and momenta
relax slowly, due to the ... | 1304.4249v3 |
2014-05-15 | Anomalous frequency and temperature dependent scattering and Hund's coupling in the almost quantum critical heavy fermion system CeFe$_2$Ge$_2$ | We present THz range optical conductivity data of a thin film of the near
quantum critical heavy fermion compound CeFe$_2$Ge$_2$. Our complex
conductivity measurements find a deviation from conventional Drude-like
transport in a temperature range previously reported to exhibit unconventional
behavior. We calculate the ... | 1405.4007v3 |
2014-05-23 | Growth and characterization of heteroepitaxial La-substituted BaSnO$_3$ films on SrTiO$_3$ (001) and SmScO$_3$ (110) substrates | Heteroepitaxial growth of BaSnO$_3$ (BSO) and Ba$_{1-x}$La$_x$SnO$_3$ (x = 7
%) (LBSO) thin films on different perovskite single crystal (SrTiO$_3$ (001)
and SmScO$_3$ (110)) substrates has been achieved by Pulsed Laser Deposition
(PLD) under optimized deposition conditions. X-ray diffraction measurements
indicate that... | 1405.6233v1 |
2014-05-31 | Scale-Invariant Dissipationless Chiral Transport in Magnetic Topological Insulators beyond the Two-Dimensional Limit | We investigate the quantum anomalous Hall Effect (QAHE) and related chiral
transport in the millimeter-size (Cr0.12Bi0.26Sb0.62)2Te3 films. With high
sample quality and robust magnetism at low temperatures, the quantized Hall
conductance of e2/h is found to persist even when the film thickness is beyond
the two-dimensi... | 1406.0106v2 |
2014-09-11 | High performance solar cells based on graphene-GaAs heterostructures | The honeycomb connection of carbon atoms by covalent bonds in a macroscopic
two-dimensional scale leads to fascinating graphene and solar cell based on
graphene/silicon Schottky diode has been widely studied. For solar cell
applications, GaAs is superior to silicon as it has a direct band gap of 1.42
eV and its electro... | 1409.3500v3 |
2014-10-13 | Breakdown of Three-dimensional Dirac Semimetal State in pressurized Cd3As2 | We report the first observation of a pressure-induced breakdown of the 3D-DSM
state in Cd3As2, evidenced by a series of in-situ high-pressure synchrotron
X-ray diffraction (XRD) and single crystal transport measurements. We find that
Cd3As2 undergoes a structural phase transition from a metallic tetragonal (T)
phase in... | 1410.3213v4 |
2014-11-13 | Analysis of viscoelastic soft dielectric elastomer generators operating in an electrical circuit | A predicting model for soft Dielectric Elastomer Generators (DEGs) must
consider a realistic model of the electromechanical behaviour of the elastomer
filling, the variable capacitor and of the electrical circuit connecting all
elements of the device. In this paper such an objective is achieved by
proposing a complete ... | 1411.3613v2 |
2014-11-28 | Growth control of the oxidation state in vanadium oxide thin films | Precise control of the chemical valence or oxidation state of vanadium in
vanadium oxide thin films is highly desirable for not only fundamental
research, but also technological applications that utilize the subtle change in
the physical properties originating from the metal- insulator transition (MIT)
near room temper... | 1411.7922v1 |
2014-12-05 | Effects of Oxygen Adsorption on the Surface State of Epitaxial Silicene on Ag(111) | Epitaxial silicene, which is one single layer of silicon atoms packed in a
honeycomb structure, demonstrates a strong interaction with the substrate that
dramatically affects its electronic structure. The role of electronic coupling
in the chemical reactivity between the silicene and the substrate is still
unclear so f... | 1412.1887v1 |
2015-02-10 | Ultrafast dynamic conductivity and scattering rate saturation of photoexcited charge carriers in silicon investigated with a midinfrared continuum probe | We employ ultra-broadband terahertz-midinfrared probe pulses to characterize
the optical response of photoinduced charge-carrier plasmas in high-resistivity
silicon in a reflection geometry, over a wide range of excitation densities
(10^{15}-10^{19} cm^{-3}) at room temperature. In contrast to conventional
terahertz sp... | 1502.02829v1 |
2015-03-03 | Construction of force measuring optical tweezers instrumentation and investigations of biophysical properties of bacterial adhesion organelles | Optical tweezers are a technique in which microscopic-sized particles,
including living cells and bacteria, can be non-intrusively trapped with high
accuracy solely using focused light. The technique has therefore become a
powerful tool in the field of biophysics. Optical tweezers thereby provide
outstanding manipulati... | 1503.00881v1 |
2015-03-30 | Microbranching in mode-I fracture using large scale simulations of amorphous and perturbed lattice models | We study the high-velocity regime mode-I fracture instability when small
microbranches start to appear near the main crack, using large scale
simulations. Some of the features of those microbranches have been reproduced
qualitatively in smaller scale studies (using ${\cal O}(10^4)$ atoms) on both a
model of an amorphou... | 1503.08616v2 |
2016-04-12 | An invisible non-volatile solid-state memory | Information technologies require entangling data stability with encryption
for a next generation of secure data storage. Current magnetic memories,
ranging from low-density stripes up to high-density hard drives, can ultimately
be detected using routinely available probes or manipulated by external
magnetic perturbatio... | 1604.03383v2 |
2016-05-19 | Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures | The discovery of two-dimensional superconductivity in Bi2Te3/FeTe
heterostructure provides a new platform for the search of Majorana fermions in
condensed matter systems. Since Majorana fermions are expected to reside at the
core of the vortices, a close examination of the vortex dynamics in
superconducting interface i... | 1605.05903v1 |
2016-07-06 | Chiral anomaly from strain-induced gauge fields in Dirac and Weyl semimetals | Dirac and Weyl semimetals form an ideal platform for testing ideas developed
in high energy physics to describe massless relativistic particles. One such
quintessentially field-theoretic idea of chiral anomaly already resulted in the
prediction and subsequent observation of the pronounced negative
magnetoresistance in ... | 1607.01810v2 |
2016-11-17 | Interfacial thermal conductance in graphene/black phosphorus heterogeneous structures | Graphene, as a passivation layer, can be used to protect the black phosphorus
from the chemical reaction with surrounding oxygen and water. However, black
phosphorus and graphene heterostructures have low efficiency of heat
dissipation due to its intrinsic high thermal resistance at the interfaces. The
accumulated ener... | 1611.05598v1 |
2017-06-08 | Electronic and phonon excitations in α-RuCl$_3$ | We report on THz, infrared reflectivity and transmission experiments for wave
numbers from 10 to 8000 cm$^{-1}$ ($\sim$ 1 meV - 1 eV) and for temperatures
from 5 to 295 K on the Kitaev candidate material {\alpha}-RuCl$_3$. As reported
earlier, the compound under investigation passes through a first-order
structural pha... | 1706.02724v2 |
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