benchmarks/materials/supercon_tc/data/README.md

supercon_tc — data file

Usage

bash download.sh   # writes data.csv in this directory

Requires: python3 (stdlib only — csv, zipfile, io, urllib). No third-party packages needed. The script downloads the raw ZIP from the UCI ML Repository, extracts unique_m.csv, keeps only the 77 elements with non-zero fractions in at least one row, and writes data.csv. Runtime: ~15 s on a typical connection.

data.csv is gitignored per the repo-wide rule (benchmarks/**/data/data.* in .gitignore) — always rebuild locally with this script. Only this README.md is kept in git.

Source

Field	Value
Dataset	SuperCon / NIMS superconductor database (via UCI ML Repository)
URL	https://archive.ics.uci.edu/static/public/464/superconductivty+data.zip
License	unknown (NIMS SuperCon database, publicly accessible, no explicit license)
Paper	Hamidieh, K., Computational Materials Science 154, 346–354 (2018)
DOI	https://doi.org/10.1016/j.commatsci.2018.07.052
Retrieved	2026-04-22

The critical temperature values are experimentally measured from the NIMS SuperCon database of inorganic superconductors. The element mole fractions come directly from the chemical formula of each material (column unique_m.csv in the original ZIP).

Column layout

Column 0 is the output. Columns 1–77 are element mole fractions (values are non-zero for at least one material; 9 noble-gas / unstable elements dropped as all-zero: He, Ne, Ar, Kr, Xe, Pm, Po, At, Rn).

Col	Name	Units	Role
0	critical_temp	K	output
1	frac_Ag	dimensionless	input
2	frac_Al	dimensionless	input
3	frac_As	dimensionless	input
4	frac_Au	dimensionless	input
5	frac_B	dimensionless	input
6	frac_Ba	dimensionless	input
7	frac_Be	dimensionless	input
8	frac_Bi	dimensionless	input
9	frac_Br	dimensionless	input
10	frac_C	dimensionless	input
11	frac_Ca	dimensionless	input
12	frac_Cd	dimensionless	input
13	frac_Ce	dimensionless	input
14	frac_Cl	dimensionless	input
15	frac_Co	dimensionless	input
16	frac_Cr	dimensionless	input
17	frac_Cs	dimensionless	input
18	frac_Cu	dimensionless	input
19	frac_Dy	dimensionless	input
20	frac_Er	dimensionless	input
21	frac_Eu	dimensionless	input
22	frac_F	dimensionless	input
23	frac_Fe	dimensionless	input
24	frac_Ga	dimensionless	input
25	frac_Gd	dimensionless	input
26	frac_Ge	dimensionless	input
27	frac_H	dimensionless	input
28	frac_Hf	dimensionless	input
29	frac_Hg	dimensionless	input
30	frac_Ho	dimensionless	input
31	frac_I	dimensionless	input
32	frac_In	dimensionless	input
33	frac_Ir	dimensionless	input
34	frac_K	dimensionless	input
35	frac_La	dimensionless	input
36	frac_Li	dimensionless	input
37	frac_Lu	dimensionless	input
38	frac_Mg	dimensionless	input
39	frac_Mn	dimensionless	input
40	frac_Mo	dimensionless	input
41	frac_N	dimensionless	input
42	frac_Na	dimensionless	input
43	frac_Nb	dimensionless	input
44	frac_Nd	dimensionless	input
45	frac_Ni	dimensionless	input
46	frac_O	dimensionless	input
47	frac_Os	dimensionless	input
48	frac_P	dimensionless	input
49	frac_Pb	dimensionless	input
50	frac_Pd	dimensionless	input
51	frac_Pr	dimensionless	input
52	frac_Pt	dimensionless	input
53	frac_Rb	dimensionless	input
54	frac_Re	dimensionless	input
55	frac_Rh	dimensionless	input
56	frac_Ru	dimensionless	input
57	frac_S	dimensionless	input
58	frac_Sb	dimensionless	input
59	frac_Sc	dimensionless	input
60	frac_Se	dimensionless	input
61	frac_Si	dimensionless	input
62	frac_Sm	dimensionless	input
63	frac_Sn	dimensionless	input
64	frac_Sr	dimensionless	input
65	frac_Ta	dimensionless	input
66	frac_Tb	dimensionless	input
67	frac_Tc	dimensionless	input
68	frac_Te	dimensionless	input
69	frac_Ti	dimensionless	input
70	frac_Tl	dimensionless	input
71	frac_Tm	dimensionless	input
72	frac_V	dimensionless	input
73	frac_W	dimensionless	input
74	frac_Y	dimensionless	input
75	frac_Yb	dimensionless	input
76	frac_Zn	dimensionless	input
77	frac_Zr	dimensionless	input

Dataset statistics (after download)

• Rows: 21,263
• Columns: 78 (1 output + 77 element fraction inputs)
• Distinct elements: 77 (9 all-zero elements dropped: He, Ne, Ar, Kr, Xe, Pm, Po, At, Rn)
• Output range: [0.00021, 185.0] K (critical temperature)
• Output median: ~20.0 K
• Output mean: ~34.42 K
• No missing values (element fractions are 0.0 for absent elements)
• Tc == 0 rows: 0 (all rows have positive Tc)