High-entropy silicide superconductors with W5Si3 -type structure
Open accessAbstract
We report the synthesis, crystal structure, and physical properties of two new high-entropy silicides (HESs), namely ${({\mathrm{Nb}}_{0.1}{\mathrm{Mo}}_{0.3}{\mathrm{W}}_{0.3}{\mathrm{Re}}_{0.2}{\mathrm{Ru}}_{0.1})}_{5}{\mathrm{Si}}_{3}$ and ${({\mathrm{Nb}}_{0.2}{\mathrm{Mo}}_{0.3}{\mathrm{W}}_{0.3}{\mathrm{Re}}_{0.1}{\mathrm{Ru}}_{0.1})}_{5}{\mathrm{Si}}_{3}$. Structural analysis indicates that both HESs consist of a (nearly) single tetragonal ${\mathrm{W}}_{5}{\mathrm{Si}}_{3}$-type phase (space group $I4/mcm$) with a disordered cation distribution. Electrical resistivity, magnetic susceptibility, and specific heat measurements show that ${({\mathrm{Nb}}_{0.1}{\mathrm{Mo}}_{0.3}{\mathrm{W}}_{0.3}{\mathrm{Re}}_{0.2}{\mathrm{Ru}}_{0.1})}_{5}{\mathrm{Si}}_{3}$ and ${({\mathrm{Nb}}_{0.2}{\mathrm{Mo}}_{0.3}{\mathrm{W}}_{0.3}{\mathrm{Re}}_{0.1}{\mathrm{Ru}}_{0.1})}_{5}{\mathrm{Si}}_{3}$ are weakly coupled bulk superconductors, which represent the first superconducting high-entropy nonoxide ceramics. In particular, these HESs have higher ${T}_{\mathrm{c}}$ values (3.2--3.3 K) compared with those of the binary counterparts and their ${B}_{\mathrm{c}2}(0)/{T}_{\mathrm{c}}$ ratios are the largest among superconductors of the same structural type.
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The upper critical fields appear to increase with increasing entropy in some high-entropy systems.
“Furthermore, the upper critical fi elds appear to increase with increasing entropy in some high-entropy systems 9,44,70 .”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [70]
The Results and Discussion (page unavailable) report that the high-entropy silicides have higher upper-critical-field-to-transition-temperature ratios than comparable W₅Si₃-type superconductors, and note similar enhancement in some high-entropy alloys. The paper does not establish that the upper critical fields themselves increase as entropy increases; it compares ratios across materials and speculates that increased disorder explains the enhancement. (LLM, conf=0.84)
Experimental — accuracy not yet measuredIn some HEA systems, high-entropy superconductors have higher μ0Hc2(0)/Tc values than binary or ternary compounds.
“In some HEA systems, high-entropy superconductors appear to have higher μ 0Hc2(0)/ T c values than binary or ternary compounds 44,70 .”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [70]
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- Authors
- Liu, B., Yang, W., Xiao, G., Zhu, Q., Song, S., Cao, G.-H., & Ren, Z.
- Affiliations
- Kunming University of Science and Technology (CN)
- Fudan University (CN)
- Westlake University (CN)
- Zhejiang University (CN)
- Corresponding author
- Liu, Bin
- Venue
- Physical Review Materials
- Publisher
- American Physical Society (APS)
- Published
- 2023-01-31
- Volume
- 7
- Issue
- 1
- ISSN
- 2475-9953 (ISSN-L)
- OpenAlex
- W4318701950
- Cited by
- 24
- References
- 48
- Citations by year
- 2026: 3 · 2025: 8 · 2024: 9 · 2023: 4
- FWCI
- 2.55
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Physical Review Materials (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Natural Science Foundation of China (12050003)
- Topics
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
- Physical Sciences › Engineering › Mechanical Engineering › High Entropy Alloys Studies
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Rare-earth and actinide compounds
- Keywords
- superconductivity, bulk superconductors, non-oxide ceramics, critical temperature, upper critical field, electrical resistivity, magnetic susceptibility, specific heat
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