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2013-10-14 | Element spots in HgMn stars | A fraction of late B-type stars, the so-called HgMn stars, exhibit enhanced
absorption lines of certain chemical elements, notably Hg and Mn, combined with
an underabundance of He. For about a decade now the elements with anomalously
high abundances in HgMn stars are known to be distributed inhomogeneously over
the ste... | 1310.3686v1 |
2013-11-12 | Feasibility Study on SRF Cavity Improvement by Doping Method | In this article a new idea is proposed by PKU group to improve the RF
superconductive property of niobium cavity. Rare earth elements like scandium
and yttrium are doped into ingot niobium during the smelting processes. A
series of experiments have been done since 2010, and the preliminary testing
results show that the... | 1311.2710v1 |
2013-12-12 | Commissioning of the Francium Trapping Facility at TRIUMF | We report on the successful commissioning of the Francium Trapping Facility
at TRIUMF. Large laser-cooled samples of francium are produced from a francium
ion beam delivered by the ISAC radioactive ion beam facility. The ion beam is
neutralized on an yttrium foil, which is subsequently heated to transfer the
atoms into... | 1312.3562v1 |
2014-04-11 | Rotated stripe order and its competition with superconductivity in La$_{1.88}$Sr$_{0.12}$CuO$_4$ | We report the observation of a bulk charge modulation in
La$_{1.88}$Sr$_{0.12}$CuO$_4$ (LSCO) with a characteristic in-plane wave-vector
of (0.236, $\pm \delta$), with $\delta$=0.011 r.l.u. The transverse shift of
the ordering wave-vector indicates the presence of rotated charge-stripe
ordering, demonstrating that the ... | 1404.3193v2 |
2014-04-21 | Wide-angle energy-momentum spectroscopy | Light emission is defined by its distribution in energy, momentum, and
polarization. Here, we demonstrate a method that resolves these distributions
by means of wide-angle energy-momentum spectroscopy. Specifically, we image the
back focal plane of a microscope objective through a Wollaston prism to obtain
polarized Fo... | 1404.5109v1 |
2014-06-20 | Photoluminescence of focused ion beam implanted Er$^{3+}$:Y$_{2}$SiO$_{5}$ crystals | Erbium doped low symmetry Y$_2$SiO$_5$ crystals attract a lot of attention in
perspective of quantum information applications. However, only doping of the
samples during growth is available up to now, which yields a quite homogeneous
doping density. In the present work, we deposit Er$^{3+}$-ions by the focused
ion beam... | 1406.5371v1 |
2014-10-21 | Radial velocity measurements of the pulsating zirconium star: LS IV -14 116 | The helium-rich hot subdwarf LS IV -14 116 shows remarkably high surface
abundances of zirconium, yttrium, strontium, and germanium, indicative of
strong chemical stratification in the photosphere. It also shows photometric
behaviour indicative of non-radial g-mode pulsations, despite having surface
properties inconsis... | 1410.5732v1 |
2015-01-09 | Coherent frequency up-conversion of microwaves to the optical telecommunications band in an Er:YSO crystal | The ability to convert quantum states from microwave photons to optical
photons is important for hybrid system approaches to quantum information
processing. In this paper we report the up-conversion of a microwave signal
into the optical telecommunications wavelength band using erbium dopants in a
yttrium orthosilicate... | 1501.02014v2 |
2015-01-20 | Rotational state microwave mixing for laser cooling of complex diatomic molecules | We demonstrate the mixing of rotational states in the ground electronic state
using microwave radiation to enhance optical cycling in the molecule yttrium
(II) monoxide (YO). This mixing technique is used in conjunction with a
frequency modulated and chirped continuous wave laser to slow longitudinally a
cryogenic buff... | 1501.04683v1 |
2015-03-17 | The Hubbard model in strong magnetic field: Low-frequency quantum oscillations due to strong electron correlations | The density of states of the two-dimensional fermionic Hubbard model in the
perpendicular homogeneous magnetic field is calculated using the strong
coupling diagram technique. The density of states at the Fermi level as a
function of the inverse magnetic induction oscillates, and the frequency of
these oscillations inc... | 1503.04934v1 |
2015-03-25 | Cold Brownian motion in aqueous media via anti-Stokes photoluminescence | Advances in cryogenic sciences have enabled several observations of new
low-temperature physical phenomena including superconductivity, superfluidity,
and Bose-Einstein condensates. Heat transfer is also critical in numerous
applications including thermal management within integrated microelectronics
and the regulation... | 1503.07265v1 |
2015-04-03 | High-resolution spectroscopy of single Pr$^{3+}$ ions on the $^3$H$_4$-$^1$D$_2$ transition | Rare earth ions in crystals exhibit narrow spectral features and
hyperfine-split ground states with exceptionally long coherence times. These
features make them ideal platforms for quantum information processing in the
solid state. Recently, we reported on the first high-resolution spectroscopy of
single Pr$^{3+}$ ions... | 1504.00857v1 |
2015-07-03 | Nanophotonic coherent light-matter interfaces based on rare-earth-doped crystals | Quantum light-matter interfaces (QLMIs) connecting stationary qubits to
photons will enable optical networks for quantum communications, precise global
time keeping, photon switching, and studies of fundamental physics.
Rare-earth-ion (REI) doped crystals are state-of-the-art materials for optical
quantum memories and ... | 1507.00977v1 |
2015-10-19 | Ferroelectric polarization switching with a remarkably high activation-energy in orthorhombic GaFeO3 thin films | Orthorhombic GaFeO3 (o-GFO) with the polar Pna21 space group is a prominent
ferrite by virtue of its piezoelectricity and ferrimagnetism, coupled with
magneto-electric effects. Herein, we unequivocally demonstrate a large
ferroelectric remanent polarization in undoped o-GFO thin films by adopting
either a hexagonal str... | 1510.05359v1 |
2015-10-29 | Controlled emission and coupling of small-size YAG:Ce3+ nanocrystals to gold nanowire | We report a controlled emission of Ce3+ ions inside single Yttrium Aluminum
Gar- net Y3Al5O12 (YAG:Ce3+) nanocrystals with a diameter of 22 +- 10 nm as a
result of a coupling of a surface plasmon mode propagating along single gold
nanowire (NW). From the PL images, the intensity for single YAG:Ce3+
nanocrystals in the ... | 1510.08769v1 |
2015-12-11 | Coupling erbium spins to a three-dimensional superconducting cavity at zero magnetic field | We experimentally demonstrate the coupling at zero magnetic field of an
isotopically pure erbium doped yttrium orthosilicate crystal ($^{167}$Er:YSO)
to a three-dimensional superconducting cavity with a $Q$ factor of $10^5$. A
tunable loop-gap resonator is used, and its resonance frequency is tuned to
observe the hyper... | 1512.03606v2 |
2016-02-08 | Phase separated behavior in Yttrium doped CaMnO3 | The effect of electron doping on the structural, transport, and magnetic
properties of Mn (IV) - rich Ca1-xYxMnO3 (x < 0.2) samples have been
investigated using neutron diffraction, neutron depolarization, magnetization
and resistivity techniques. The temperature dependence of resistivity follows
the small polaron mode... | 1602.02479v1 |
2016-07-05 | Effects of intense optical phonon pumping on the structure and electronic properties of yttrium barium copper oxide | We investigate the structural modulations induced by optical excitation of a
polar phonon mode in YBa$_2$Cu$_3$O$_7$, using first-principles calculations
based on density functional theory. We focus on the intense-excitation regime
in which we expect that fourth-order phonon-phonon coupling terms dominate, and
model th... | 1607.01180v2 |
2017-02-08 | Low-Temperature Microwave Properties of Biaxial YAlO3 | Low-loss crystals with defects due to paramagnetic or rare earth impurity
ions is a major area of investigation for quantum hybrid systems at both
optical and microwave frequencies. In this work we examine the single crystal
yttrium aluminium perovskite, YAlO$_3$ using the Whispering Gallery Mode
Technique. Multiple re... | 1702.02288v2 |
2017-12-22 | Magnetoresistance in YBi and LuBi semimetals due to nearly perfect carrier compensation | Monobismuthides of yttrium and lutetium are shown as new representatives of
materials which exhibit extreme magnetoresistance and magnetic-field-induced
resistivity plateau. At low temperatures and in magnetic field of 9T the
magnetoresistance attains the order of magnitude of 10,000% and 1,000%, on YBi
and LuBi, respe... | 1712.08433v3 |
2018-03-20 | Optically addressing single rare-earth ions in a nanophotonic cavity | We demonstrate optical probing of spectrally resolved single Nd rare-earth
ions in yttrium orthovanadate. The ions are coupled to a photonic crystal
resonator and show strong enhancement of the optical emission rate via the
Purcell effect, resulting in near radiatively limited single photon emission.
The measured high ... | 1803.07520v2 |
2018-08-03 | 3-D Magneto-Optical Trap of Yttrium Monoxide | We report three-dimensional trapping of an oxide molecule (YO), using a
radio-frequency magneto-optical trap (MOT). The total number of molecules
loaded is $\sim$1.5$\times10^4$ , with a temperature of 7(1)~mK. This
diversifies the frontier of molecules that are laser coolable and paves the way
for the second-stage nar... | 1808.01067v1 |
2018-08-21 | Superconductivity at 215 K in lanthanum hydride at high pressures | We synthesized lanthanum hydride (LaHx) by laser heating of lanthanum in
hydrogen atmosphere at pressure P = 170 GPa. The sample shows a superconducting
step at 209 K and 170 GPa and temperature dependence of resistance. By
releasing the pressure to 150 GPa, the superconducting transition temperature
Tc increases to 21... | 1808.07039v1 |
2018-10-06 | Ultrafast negative thermal expansion driven by spin-disorder | We measure the transient strain profile in a nanoscale multilayer system
composed of Yttrium, Holmium and Niobium after laser excitation using ultrafast
X-ray diffraction. The strain propagation through each layer is determined by
transient changes of the material-specific Bragg angles. We experimentally
derive the exp... | 1810.03036v1 |
2018-10-30 | Magnetic field sensing with the kinetic inductance of a high-$T_\mathrm{c}$ superconductor | We carry out an experimental feasibility study of a magnetic field sensor
based on the kinetic inductance of the high-$T_\mathrm{c}$ superconductor
yttrium barium copper oxide. We pattern thin superconducting films into
radio-frequency resonators that feature a magnetic field pick-up loop. At 77 K
and for film thicknes... | 1810.12725v1 |
2018-11-14 | Observation of Optical Refrigeration in a Holmium-doped Crystal | We report the first demonstration of solid-state optical refrigeration of a
Ho-doped material. A 1 mol% Ho-doped Yttrium Lithium Fluoride (YLF) crystal is
cooled by mid-IR laser radiation, and its external quantum efficiency and
parasitic background absorption are evaluated. Using detailed
temperature-dependent spectro... | 1811.05745v1 |
2018-12-05 | Influence of composition and heating schedules on compatibility of FeCrAl alloys with high-temperature steam | FeCrAl alloys are proposed and being intensively investigated as alternative
accident tolerant fuel (ATF) cladding for nuclear fission application. Herein,
the influence of major alloy elements (Cr and Al), reactive element effect and
heating schedules on the oxidation behavior of FeCrAl alloys in steam up to
1500{\deg... | 1812.01850v1 |
2018-12-21 | Deep and persistent spectral holes in Tm-doped yttrium orthosilicate for imaging applications | With their optical wavelength in the near infrared (790-800nm) and their
unique spectroscopic properties at cryogenic temperatures, thulium-doped
crystals are at the center of many architectures linked to classical signal
processing and quantum information. In this work, we focus on Tm-doped YSO, a
compound that was le... | 1812.10369v2 |
2019-04-17 | Nanophotonic quantum storage at telecommunications wavelength | Quantum memories for light are important components for future long distance
quantum networks. We present on-chip quantum storage of telecommunications band
light at the single photon level in an ensemble of erbium-167 ions in an
yttrium orthosilicate photonic crystal nanobeam resonator. Storage times of up
to 10 $\mu$... | 1904.08052v1 |
2019-04-17 | Aqueous metal-organic solutions for YSZ thin film inkjet deposition | Inkjet printing of 8% Y2O3-stabilized ZrO2 (YSZ) thin films is achieved by
designing a novel water-based reactive ink for Drop-on-Demand (DoD) inkjet
printing. The ink formulation is based on a novel chemical strategy that
consists of a combination of metal oxide precursors (zirconium alkoxide and
yttrium salt), water ... | 1904.08143v1 |
2019-07-28 | Coherent control and single-shot readout of a rare-earth ion embedded in a nanophotonic cavity | Quantum networks based on optically addressable spin qubits promise to enable
secure communication, distributed quantum computing, and tests of fundamental
physics. Scaling up quantum networks based on solid-state luminescent centers
requires coherent spin and optical transitions coupled to photonic resonators.
Here we... | 1907.12161v1 |
2019-08-18 | Pressure induced electronic structure transformation of topological semimetal | We study the electronic structure change of yttrium trihydride
$\mathrm{YH_3}$ by applying a hydrostatic pressure. At zero pressure,
$\mathrm{YH_3}$ has the structure with energy favored symmetry group
$P\bar{3}c1$ (165). From first principle calculation, we argue that the band
crossings are caused by overlapping of an... | 1908.06494v2 |
2019-08-28 | Alkali ion-to-neutral atom converter for the magneto-optical trap of a radioactive isotope | We have developed a unique neutralizer device that uses an yttrium target
surrounded by a platinum wall to magneto-optically trap radioactive atoms. In
general, the radioactive nucleus produced in a nuclear reaction is extracted
and transported in ion form. For the magneto-optical trap, thermal
neutralization must occu... | 1908.10686v1 |
2019-09-26 | Coherent charge and magnetic ordering in Ho/Y superlattice revealed by element-selective x-ray scattering | Magnetic rare-earth / non-magnetic metal superlattices are well-known to
display chiral spin helices in the rare-earth layers that propagate coherently
across the non-magnetic layers. However, the underlying mechanism that
preserves the magnetic phase and chirality coherence across the non-magnetic
layers has remained ... | 1909.12372v2 |
2019-10-04 | Solid-state laser refrigeration of a semiconductor optomechanical resonator | Photothermal heating represents a major constraint that limits the
performance of many nanoscale optoelectronic and optomechanical devices
including nanolasers, quantum optomechanical resonators, and integrated
photonic circuits. Although radiation-pressure damping has been reported to
cool an individual vibrational mo... | 1910.02153v1 |
2019-10-20 | A search for heavy-metal stars: abundance analyses of hot subdwarfs with Subaru | The discovery of extremely zirconium- and lead-rich surfaces amongst a small
subgroup of hot subdwarfs has provoked questions pertaining to chemical
peculiarity in hot star atmospheres and about their evolutionary origin. With
only three known in 2014, a limited search for additional `heavy-metal'
subdwarfs was initiat... | 1910.08947v1 |
2019-10-31 | Optically unstable phase from ion-ion interactions in an erbium doped crystal | We demonstrate an optical unstable phase for a laser driven erbium ion
ensemble. The transmitted light through an erbium-doped yttrium orthosillicate
crystal becomes dynamically unstable when illuminated by a strong
continuous-wave laser. Transient net gain was recorded if the light passes the
sample twice. The experim... | 1910.14298v2 |
2019-12-08 | On-chip coherent microwave-to-optical transduction mediated by ytterbium in YVO$_4$ | Optical networks that distribute entanglement among quantum technologies will
form a powerful backbone for quantum science but are yet to interface with
leading quantum hardware such as superconducting qubits. Consequently, these
systems remain isolated because microwave links at room temperature are noisy
and lossy. B... | 1912.03671v1 |
2019-12-16 | The nature of the photometric variability of HgMn stars: A test of simulated light curves of φ Phe against the TESS data | The inhomogeneous surface distribution of heavy elements is known to cause
periodic light variability of magnetic chemically peculiar stars. It is unclear
to what extent the same paradigm applies to mercury-manganese (HgMn) stars. We
aim to model the photometric variability of the HgMn star {\phi}Phe using
abundance ma... | 1912.07265v1 |
2020-01-15 | Stability and superconductivity of lanthanum and yttrium decahydrides | Rare-earth hydrides can exhibit high-temperature superconductivity under high
pressure. Here, we apply a crystal structure prediction method to the current
record-holding $T_c$ material, LaH$_{10}$, and a candidate for even higher
$T_c$, YH$_{10}$. We find a pressure-induced phase transition from the
experimentally obs... | 2001.05305v3 |
2020-01-31 | Sub-Doppler Cooling and Compressed Trapping of YO Molecules at $μ$K Temperatures | Complex molecular structure demands customized solutions to laser cooling by
extending its general set of principles and practices. Yttrium monoxide (YO)
has unique intramolecular interactions. The Fermi-contact interaction dominates
over the spin-rotation coupling, resulting in two manifolds of closely spaced
states, ... | 2002.00056v1 |
2020-05-27 | Demonstration of site-selective angular-resolved absorption spectroscopy of the $^{4}I_{15/2} \rightarrow $$^{4}I_{13/2}$ erbium transition in the monoclinic crystal Y$_2$SiO$_5$ | We study the angular dependence in polarized light of the optical absorption
for the Er$^{3+}$ transition $^{4}I_{15/2} \rightarrow $$^{4}I_{13/2}$ in
Y$_2$SiO$_5$, revealing thus the associated anisotropy and the orientation of
the related absorption principal directions in the dielectric plan
perpendicular to the mon... | 2005.13626v2 |
2020-08-25 | Multifunctional on-chip storage at telecommunication wavelength for quantum networks | Quantum networks will enable a variety of applications, from secure
communication and precision measurements to distributed quantum computing.
Storing photonic qubits and controlling their frequency, bandwidth and
retrieval time are important functionalities in future optical quantum
networks. Here we demonstrate these... | 2008.10795v1 |
2020-09-02 | Peculiarities of Abundances of Selected Elements in Metal-Rich Field RR Lyrae Stars | We use the data of our extended catalog of spectroscopic determinations of
elemental abundances in the atmospheres of Galactic-field RR Lyrae type
variables to show that metal-rich RR Lyraes ($\rm{[Fe/H]} > -1.0$) have
anomalous abundances of some elements. In particular, the relative abundances
of scandium, titanium, ... | 2009.00906v1 |
2020-09-29 | Distal edge determination precision for a multi-slat promptgamma camera: a comprehensive simulation and optimization of the detection system | Multi-slat prompt-gamma camera is a promising tool for range monitoring
during proton therapy. We report the results of a comprehensive simulation
study analyzing the precision which is possible to reach with this camera in
determination of the position of the distal edge of the Bragg peak. For the
first time we includ... | 2009.14154v2 |
2020-11-03 | Strongly correlated bistable sublattice and temperature hysteresis of elastic and thermal crystal properties | It is shown that in crystal lattices with a basis the cooperative behavior of
a certain type of atoms performing optical long-wavelength vibrations in a
double-well potential of the field of the matrix lattice may lead to the
formation of a bistable sublattice. As a result of the interaction of the
metastable states of... | 2011.01594v1 |
2020-12-11 | Local-mean preserving post-processing step for non-negativity enforcement in PET imaging: application to $^{90}$Y-PET | In a low-statistics PET imaging context, the positive bias in regions of low
activity is a burning issue. To overcome this problem, algorithms without the
built-in non-negativity constraint may be used. They allow negative voxels in
the image to reduce, or even to cancel the bias. However, such algorithms
increase the ... | 2012.06432v1 |
2021-02-03 | Evolutionary search for cobalt-rich compounds in the yttrium-cobalt-boron system | Modern high-performance permanent magnets are made from alloys of rare earth
and transition metal elements, and large magnetization is achieved in the
alloys with high concentration of transition metals. We applied evolutionary
search scheme based on first-principles calculations to the Y-Co-B system and
predicted 37 c... | 2102.02097v1 |
2021-04-03 | Characterization of Er$^{3+}$:YVO$_{4}$ for microwave to optical transduction | Quantum transduction between microwave and optical frequencies is important
for connecting superconducting quantum platforms in a quantum network.
Ensembles of rare-earth ions are promising candidates to achieve this
conversion due to their collective coherent properties at microwave and optical
frequencies. Erbium ion... | 2104.01501v1 |
2021-04-09 | Polarons formation in Bi-deficient BaBiO$_3$ | BaBiO$_3$ is a charged ordered Peierls-like perovskite well known for its
superconducting properties upon K or Pb doping. We present a study on the
transport and electronic properties of BaBiO$_3$ perovskite with strong
Bi-deficiency. We show that it is possible to synthesize BaBiO$_3$ thin layers
with Bi-vacancies abo... | 2104.04573v1 |
2021-05-12 | Probing Strong Coupling between a Microwave Cavity and a Spin Ensemble with Raman Heterodyne Spectroscopy | Raman heterodyne spectroscopy is a powerful tool for characterizing the
energy and dynamics of spins. The technique uses an optical pump to transfer
coherence from a spin transition to an optical transition where the coherent
emission is more easily detected.
Here Raman heterodyne spectroscopy is used to probe an iso... | 2105.05387v1 |
2021-06-06 | Prediction of half-metallicity and spin-gapless semiconducting behavior in the new series of FeCr-based quaternary Heusler alloys: an ab initio study | This paper presents a detailed investigation of FeCr-based quaternary Heusler
alloys. By using ultrasoft pseudopotential, electronic and magnetic properties
of the compounds are studied within the framework of Density Functional Theory
(DFT) by using the Quantum Espresso package. The thermodynamic, mechanical, and
dyna... | 2106.03026v1 |
2021-07-13 | High Phase-Space Density of Laser-Cooled Molecules in an Optical Lattice | We report laser cooling and trapping of yttrium monoxide (YO) molecules in an
optical lattice. We show that gray molasses cooling remains exceptionally
efficient for YO molecules inside the lattice with a molecule temperature as
low as 6.1(6) $\mu$K. This approach has produced a trapped sample of 1200
molecules, with a... | 2107.06422v2 |
2021-08-11 | Optical excitation and probing of the antiferromagnetic modes with non-uniform in-depth distribution in birefringent antiferromagnetic crystals | Optical pump-probe setups are commonly used for excitation and investigation
of the spin dynamics in various types of magnetic materials. However, usually
the spatially homogeneous excitation is considered. In the present study we
describe an approach for optical excitation of the nonuniform THz spin dynamics
and for p... | 2108.05443v2 |
2022-01-29 | Vibrational fingerprints of ferroelectric hafnia | Hafnia (HfO2) is a promising material for emerging chip applications due to
its high-k dielectric behaviour, suitability for negative capacitance
heterostructures, scalable ferroelectricity, and silicon compatibility. The
lattice dynamics along with phononic properties such as thermal conductivity,
contraction, and hea... | 2201.12643v1 |
2022-06-22 | An improved smart meta-superconductor MgB2 | Increasing and improving the critical transition temperature (Tc), current
density (Jc) and Meissner effect (Hc) of conventional superconductors are the
most important problems in superconductivity research, but progress has been
slow for many years. In this study, by introducing the p-n junction
electroluminescent inh... | 2206.10940v1 |
2022-07-05 | Proposal for spin squeezing in rare-earth ion-doped crystals with a four-color scheme | Achieving spin squeezing within solid-state devices is a long standing
research goal, due to the promise of their particularities, for instance their
long coherence times, the possibility of low-temperature experiments or
integration of entanglement-assisted sensors on-chip. In this work, we
investigate an interferomet... | 2207.02169v2 |
2022-08-22 | Magnetically Tuned Continuous Transition from Weak to Strong Coupling in Terahertz Magnon Polaritons | Depending on the relative rates of coupling and dissipation, a light-matter
coupled system is either in the weak- or strong-coupling regime. Here, we
present a unique system where the coupling rate continuously increases with an
externally applied magnetic field while the dissipation rate remains constant,
allowing us ... | 2208.10030v1 |
2022-08-29 | Frequency Response Analysis of Backside Illuminated Free-Membrane Type IR Superconducting Bolometer | The IR response of a backside illuminated type Yttrium Barium Copper Oxide
(YBCO) transition-edge bolometer (TEB) in a free-membrane configuration is
measured and analyzed. The analysis is based on a comprehensive equivalent
circuit model for the bolometer structure considering all the thermal
parameters of the device.... | 2208.13711v1 |
2022-10-08 | Valence and magnetism in $\rm EuPd_3S_4$ and $\rm (Y,La)_xEu_{1-x}Pd_3S_4$ | $^{151}$Eu M\"ossbauer spectroscopy shows that yttrium substitution in
mixed-valent $\rm EuPd_3S_4$ drives the initial 50:50 mix of Eu$^{3+}$ and
Eu$^{2+}$ towards pure Eu$^{2+}$, whereas lanthanum substitution has the
opposite effect, but only for substitution levels above 50\%. We find that
total valence electron cou... | 2210.03860v1 |
2022-11-04 | In-plane anisotropy of electrical transport in Y$_{0.85}$Tb$_{0.15}$Ba$_2$Cu$_3$O$_{7-x}$ films | We fabricate high-quality c-axis oriented epitaxial YBa$_2$Cu$_3$O$_{7-x}$
films with 15% of yttrium atoms replaced by terbium (YTBCO) and study their
electrical properties. The Tb substitution reduces the charge carrier density
resulting in increased resistivity and decreased critical current density
compared to the p... | 2211.02564v2 |
2022-12-03 | Microstructure Evolution of Solid Oxide Fuel Cell Anodes Characterized by Persistent Homology | Uncovering microstructure evolution mechanisms that accompany the long-term
operation of solid oxide fuel cells is a fundamental challenge in designing a
more durable energy system for the future. To date, the study of fuel cell
stack degradation has focused mainly on electrochemical performance and, more
rarely, on av... | 2212.01576v1 |
2023-02-02 | Superconducting phases of YH9 under pressure | Yttrium superhydrides has attracted much attention due to their multiple
stoichiometries and excellent superconductivities under high pressure.
Especially, YH9 have a Tc of 243 K, which is the second highest Tc among all
binary hydrides. It exhibits a positive pressure dependence of Tc below 200
GPa, contrary to the re... | 2302.01122v2 |
2023-06-26 | Discovery of a 760 nm P Cygni line in AT2017gfo: Identification of yttrium in the kilonova photosphere | Neutron star mergers are believed to be a major cosmological source of rapid
neutron-capture elements. The kilonovae associated with neutron star mergers
have to date yielded only a single well-identified spectral signature: the P
Cygni line of Sr$^+$ at about 1$\mu$m in the spectra of the optical transient,
AT2017gfo.... | 2306.14942v1 |
2023-09-25 | Simultaneous High-Speed and Low-Dose 4-D STEM Using Compressive Sensing Techniques | Here we show that compressive sensing allow 4-dimensional (4-D) STEM data to
be obtained and accurately reconstructed with both high-speed and low fluence.
The methodology needed to achieve these results compared to conventional 4-D
approaches requires only that a random subset of probe locations is acquired
from the t... | 2309.14055v3 |
2023-10-10 | Optical assembly of nanostructures mediated by surface roughness | Rigorous understanding of the self-assembly of colloidal nanocrystals is
crucial to the development of tailored nanostructured materials. Despite
extensive studies, a mechanistic understanding of self-assembly under
non-equilibrium driven by an external field remains an ongoing challenge. We
demonstrate self-assembly b... | 2310.06774v1 |
2023-11-28 | Spectral Multiplexing of Rare-earth Emitters in a Co-doped Crystalline Membrane | The spectral addressing of many individual rare-earth dopants in optical
resonators offers great potential for realizing distributed quantum information
processors. To this end, it is required to understand and control the spectral
properties of the emitters in micron-scale devices. Here, erbium emitters are
investigat... | 2311.16875v2 |
2024-01-21 | Levitodynamic spectroscopy for single nanoparticle characterisation | Fast detection and characterization of single nanoparticles such as viruses,
airborne aerosols and colloidal particles are considered to be particularly
important for medical applications, material science and atmospheric physics.
In particular, non-intrusive optical characterization, which can be carried out
in isolat... | 2401.11551v1 |
2024-02-04 | High temperature deformation mechanisms in monolithic 3YTZP and 3YTZP containing single wall carbon nanotubes | Monolithic 3YTZP and 3YTZP containing 2.5 vol.% of single-walled carbon
nanotubes (SWCNT) were fabricated by Spark Plasma Sintering (SPS) at 1250 C.
Microstructural characterization of the as-fabricated 3YTZP/SWCNTs composite
shows a homogeneous CNTs dispersion throughout of ceramic matrix. The specimens
have been crep... | 2402.06651v1 |
1998-04-06 | Detection of an iron K Emission Line from the LINER NGC 4579 | We present the results of an ASCA observation of the LINER NGC 4579. A
point-like X-ray source is detected at the nucleus with a 2-10 keV luminosity
of 1.5x10^41 ergs/s assuming a distance of 16.8 Mpc. The X-ray spectrum is
represented by a combination of a power-law with a photon index of ~1.7 and
soft thermal compone... | 9804054v1 |
1998-10-01 | Compton reflection and iron fluorescence in AGN and GBHCs | Any cold, optically-thick matter in the vicinity of an accreting black hole,
such as the accretion disk, can intercept and reprocess some fraction of the
hard X-ray continuum emission, thereby imprinting atomic features into the
observed spectrum. This process of `X-ray reflection' primarily gives rise to a
broad refle... | 9810018v1 |
2000-10-24 | XMM-Newton observation of an unusual iron line in the quasar Markarian 205 | XMM-Newton observations of the low luminosity, radio-quiet quasar Markarian
205 have revealed a unique iron K emission line profile. In marked contrast to
the broad and redshifted iron K line commonly seen in ASCA observations of
Seyfert 1 galaxies, we find that a substantial amount of the line flux in Mrk
205 occurs a... | 0010490v1 |
2001-11-02 | Spectroscopic Signatures of Convection in the Spectrum of Procyon. Fundamental Parameters and Iron Abundance | We have observed the spectrum of Procyon A (F5IV) from 4559 to 5780 A with a
S/N of ~ 1e3 and a resolving power of 2e5. We have measured the line bisectors
and relative line shifts of a large number of Fe I and Fe II lines, comparing
them to those found in the Sun. A three-dimensional(3D) hydrodynamical model
atmospher... | 0111055v1 |
2002-01-09 | Dust and the spectral energy distribution of the OH/IR star OH 127.8+0.0: Evidence for circumstellar metallic iron | We present a fit to the spectral energy distribution of OH 127.8+0.0, a
typical asymptotic giant branch star with an optically thick circumstellar dust
shell. The fit to the dust spectrum is achieved using non-spherical grains
consisting of metallic iron, amorphous and crystalline silicates and water ice.
Previous simi... | 0201128v1 |
2002-04-09 | Short Timescale Correlations Between Line and Continuum Fluxes in Cygnus X-1 | We present the results of 16-s time scale spectral fits for Cygnus X-1 in the
soft state and in the transition state, using a Comptonised blackbody plus an
iron line. On these timescales, we find that that the continuum source flux can
vary by factors 2-3 and that the iron line intensity appears to track these
changes ... | 0204160v2 |
2002-10-11 | Iron abundances and heating of the ICM in hydrodynamical simulations of galaxy clusters | Results from a large set of hydrodynamical SPH simulations of galaxy clusters
in a flat LCDM cosmology are used to investigate the metal enrichment and
heating of the ICM. The physical modeling of the gas includes radiative
cooling, star formation, energy feedback and metal enrichment that follow from
the explosions of... | 0210263v2 |
2003-07-12 | Early star formation traced by the highest redshift quasars | The iron abundance relative to alpha-elements in the circumnuclear region of
quasars is regarded as a clock of the star formation history and, more
specifically, of the enrichment by SNIa. We investigate the iron abundance in a
sample of 22 quasars in the redshift range 3.0<z<6.4 by measuring their rest
frame UV FeII b... | 0307264v2 |
2003-07-16 | Abundance Analysis of Planetary Host Stars I. Differential Iron Abundances | We present atmospheric parameters and iron abundances derived from
high-resolution spectra for three samples of dwarf stars: stars which are known
to host close-in giant planets (CGP), stars for which radial velocity data
exclude the presence of a close-in giant planetary companion (no-CGP), as well
as a random sample ... | 0307321v1 |
2004-02-06 | A Two-Dimensional Hydrostatically Equilibrium Atmosphere of a Neutron Star with Given Differential Rotation | An analytic solution has been found in the Roche approximation for the
axially symmetric structure of a hydrostatically equilibrium atmosphere of a
neutron star produced by collapse. A hydrodynamic (quasione-dimensional) model
for the collapse of a rotating iron core in a massive star gives rise to a
heterogeneous rota... | 0402151v1 |
2005-04-25 | A New Model for Iron Emission Lines and Re-Burst in GRB X-Ray Afterglows | Recently iron emission features have been observed in several X-ray
afterglows of GRBs. It is found that the energy obtained from the illuminating
continuum which produces the emission lines is much higher than that of the
main burst.The observation of SN-GRB association indicates a fallback disk
should be formed after... | 0504533v2 |
2006-05-26 | High-Resolution X-ray Spectroscopy of the Interstellar Medium II: Neon and Iron Absorption Edges | We present high-resolution spectroscopy of the neon K-shell and iron L-shell
interstellar absorption edges in nine X-ray binaries using the High Energy
Transmission Grating Spectrometer (HETGS) onboard the Chandra X-ray
Observatory. We found that the iron absorption is well fit by an experimental
determination of the c... | 0605674v1 |
2007-06-21 | The nature of the fluorescent iron line in V 1486 Ori | The fluorescent 6.4 keV iron line provides information on cool material in
the vicinity of hard X-ray sources as well as on the characteristics of the
X-ray sources themselves. First discovered in the X-ray spectra of the flaring
Sun, X-ray binaries and active galactic nuclei (AGN), the fluorescent line was
also observ... | 0706.3097v1 |
2007-10-04 | New Insights on Interstellar Gas-Phase Iron | In this paper, we report on the gas-phase abundance of singly-ionized iron
(Fe II) for 51 lines of sight, using data from the Far Ultraviolet
Spectroscopic Explorer (FUSE). Fe II column densities are derived by measuring
the equivalent widths of several ultraviolet absorption lines and subsequently
fitting those to a c... | 0710.1062v1 |
2008-06-20 | Bandwidth and Fermi surface of Iron-Oxypnictides: covalency and sensitivity to structural changes | Some important aspects of the electronic structure of the iron oxypnictides
depend very sensitively on small changes in interatomic distances and bond
angles within the iron-pnictogen subunit. Using first-principles full-potential
electronic structure calculations, we investigate this sensitive dependence,
contrasting ... | 0806.3285v1 |
2008-07-24 | The Unprecedented Giant Coupling of Fe-spin State and the As-As Hybridization in Iron-Pnictide | From first principles calculations we unravel surprisingly strong
interactions between arsenic ions in iron-pnictides, the strength of which is
controlled by the Fe-spin state. Reducing the Fe-magnetic moment, weakens the
Fe-As bonding, and in turn, increases As-As interactions, causing giant
reduction in the c-axis. F... | 0807.3936v3 |
2008-12-12 | Experimental determination of the microscopic origin of magnetism in parent iron pnictides | Like high Tc cuprates, the newly discovered iron based superconductors lie in
close proximity to a magnetically ordered parent phase. However, while the
magnetic order in parent cuprates is known to derive from a spin-spin local
superexchange interaction, a plethora of experiments including neutron
scattering have so f... | 0812.2289v1 |
2009-01-27 | Correlation effects in the iron pnictides | One of the central questions about the iron pnictides concerns the extent to
which their electrons are strongly correlated. Here we address this issue
through the phenomenology of the charge transport and dynamics, single-electron
excitation spectrum, and magnetic ordering and dynamics. We outline the
evidence that the... | 0901.4112v2 |
2010-09-14 | Comment on "Isotope effect in multi-band and multi-channel attractive systems and inverse isotope effect in iron-based superconductors" by T. Yanagisawa, et al | In a recent paper Yanagisawa et al. [1] claim from a theoretical analysis of
a multi-channel multi-band superconductor model that an inverse isotope
exponent on the superconducting transition temperature Tc can be realized in
iron-based superconductors. Simultaneously, a subgroup of the authors of Ref. 1
performed the ... | 1009.2590v1 |
2010-12-23 | Fe-based high temperature superconductivity with Tc=31K bordering an insulating antiferromagnet in (Tl,K)FexSe2 Crystals | Up to now, there have been two material families, the cuprates and the
iron-based compounds with high-temperature superconductivity (HTSC). An
essential open question is whether the two classes of materials share the same
essential physics. In both, superconductivity (SC) emerges when an
antiferromagnetical (AFM) order... | 1012.5236v1 |
2011-01-17 | Modeling the iron oxides and oxyhydroxides for the prediction of environmentally sensitive phase transformations | Iron oxides and oxyhydroxides are challenging to model computationally as
competing phases may differ in formation energies by only several kJ/mol, they
undergo magnetization transitions with temperature, their structures may
contain partially occupied sites or long-range ordering of vacancies, and some
loose structure... | 1101.3105v1 |
2011-08-03 | Origin of conductivity cross over in entangled multi-walled carbon nanotube network filled by iron | A realistic transport model showing the interplay of the hopping transport
between the outer shells of iron filled entangled multi-walled carbon nanotubes
(MWNT) and the diffusive transport through the inner part of the tubes, as a
function of the filling percentage, is developed. This model is based on
low-temperature... | 1108.0881v1 |
2011-10-17 | Testing the sign-changing superconducting gap in iron-based superconductors with quasiparticle interference and neutron scattering | We present a phenomenological calculation of the quasiparticle-interference
(QPI) pattern and inelastic Neutron scattering (INS) spectra in iron-pnictide
and layered iron-selenide compounds by using materials specific band-structure
and superconducting (SC) gap properties. As both the QPI and the INS spectra
arise due ... | 1110.3834v2 |
2012-02-27 | $S_4$ Symmetric Microscopic Model for Iron-Based Superconductors | Although iron-based superconductors are multi-orbital systems with
complicated band structures, we demonstrate that the low energy physics which
is responsible for high-$T_c$ superconductivity is essentially governed by one
effective Hamiltonianwith two almost decoupled orbitals near half filling. This
underlining elec... | 1202.5881v5 |
2012-04-24 | Microstructural analysis of phase separation in iron chalcogenide superconductors | The interplay between superconductivity, magnetism and crystal structure in
iron-based superconductors is a topic of great interest amongst the condensed
matter physics community as it is thought to be the key to understanding the
mechanisms responsible for high temperature superconductivity. Alkali metal
doped iron ch... | 1204.5472v4 |
2012-04-25 | A Monte Carlo Markov Chain based investigation of black hole spin in the active galaxy NGC3783 | The analysis of relativistically broadened X-ray spectral features from the
inner accretion disk provides a powerful tool for measuring the spin of
supermassive black holes (SMBH) in active galactic nuclei (AGN). However, AGN
spectra are often complex and careful analysis employing appropriate and
self-consistent model... | 1204.5747v2 |
2012-09-19 | Orbital and spin magnetic moments of transforming 1D iron inside metallic and semiconducting carbon nanotubes | The orbital and spin magnetic properties of iron inside transforming metallic
and semiconducting 1D carbon nanotube hybrids are studied by means of local
x-ray magnetic circular dichroism (XMCD) and bulk superconducting quantum
interference device (SQUID) measurements. Nanotube hybrids are initially
ferrocene filled si... | 1209.4265v1 |
2013-03-12 | Démixtion et ségrégation superficielle dans les alliages fer-chrome | Ferritic steels possibly strengthened by oxide dispersion are candidates as
structural materials for generation IV and fusion nuclear reactors. Their use
is limited by incomplete knowledge of the iron-chromium phase diagram at low
temperatures and of the phenomena inducing preferential segregation of one
element at gra... | 1303.2938v1 |
2013-03-29 | A magnetic origin for high temperature superconductivity in iron pnictides | In conventional Bardeen-Cooper-Schrieffer (BCS) superconductors,
superconductivity occurs when electrons form coherent Cooper pairs below the
superconducting transition temperature Tc. Although the kinetic energy of
paired electrons increases in the superconducting state relative to the normal
state, the reduction in t... | 1303.7339v1 |
2013-05-03 | Photophoretic separation of metals and silicates: the formation of Mercury like planets and metal depletion in chondrites | Mercury's high uncompressed mass density suggests that the planet is largely
composed of iron, either bound within metal (mainly Fe-Ni), or iron sulfide.
Recent results from the MESSENGER mission to Mercury imply a low temperature
history of the planet which questions the standard formation models of impact
mantle stri... | 1305.0689v1 |
2013-07-03 | Galactic Constraints on Supernova Progenitor Models | We undertake a statistical analysis of the radial abundance distributions in
the Galactic disk within a theoretical framework for Galactic chemical
evolution which incorporates the influence of spiral arms. 1) The mean mass of
oxygen ejected per core-collapse SNe (CC SNe) event (which are concentrated
within spiral arm... | 1307.0928v1 |
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