Growth and Characterization of ROBiS2 High-Entropy Superconducting Single Crystals
Open accessAbstract
A series of high-entropy superconductors, ROBiS2 (R = La + Ce + Pr + Nd + Sm), have been successfully grown in the form of single crystals using CsCl flux. The obtained single crystals have a platelike shape with a size of 0.5–2.0 mm and a thickness of 70–450 μm, and they are cleavable along the c-plane. The c-axis lattice constants of the obtained ROBiS2 single crystals have similar values of 13.47–13.57 Å. The Ce in the obtained ROBiS2 single crystals was in a mixed-valence state, comprising both Ce3+ and Ce4+. On the other hand, Pr and Sm showed only the trivalent state. The superconducting transition temperatures of ROBiS2 single crystals were approximately 2–4 K. The superconducting transition temperature and superconducting anisotropies of R-site mixed high-entropy samples increased with a decrease in the mean ionic radius of the R-site. Moreover, a deviation in the tendency to exhibit superconducting properties was observed based on the difference in the R-site mixed entropy. R-site mixed entropy in ROBiS2 superconductors may affect their superconducting properties.
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In the high-entropy layer system ROBiS2, μ0Hc2(0) in the c-plane is significantly greater than its Pauli limit.
“In this high-entropy layer system, the μ 0Hc2(0) in the c -plane is signi fi cantly greater than its Pauli limit.”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [64]
The Results report that the zero-temperature upper critical field parallel to the c-plane is 16 T for sample D, significantly above its 8.46 T Pauli limit. But they also state that sample C is an exception: its field is 4.9 T, below its 6.07 T Pauli limit. The claim omits that qualification when describing the ROBiS2 system generally. (LLM, conf=0.88)
Experimental — accuracy not yet measuredHigh-entropy superconductivity is also found in layered structures, σ-type structures, and CuAl2-type structures.
“High-entropy superconductivity is also found in layered structures 61 -64 , σ -type structures 65,66 , and CuAl2-type structures 67 .”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [64]
High-entropy layer single crystals ROBiS2 (R = Sm + Nd + Pr + Ce + La) have been successfully grown via CsCl flux.
“The high-entropy layer single crystals, ROBiS2 (R = Sm + Nd + Pr + Ce + La), have been successfully grown via CsCl fl ux 64 .”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [64]
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Self-citation
- Authors
- Fujita, Y., Kinami, K., Hanada, Y., Nagao, M., Miura, A., Hirai, S., Maruyama, Y., Watauchi, S., Takano, Y., & Tanaka, I.
- Affiliations
- University of Yamanashi (JP)
- Hokkaido University (JP)
- Kitami Institute of Technology (JP)
- National Institute for Materials Science (JP)
- Corresponding author
- Nagao, Masanori
- ORCID
- Venue
- ACS Omega
- Publisher
- American Chemical Society (ACS)
- Published
- 2020-07-01
- Volume
- 5
- Issue
- 27
- Pages
- 16819-16825
- ISSN
- 2470-1343 (ISSN-L)
- PMC
- PMC7364703
- OpenAlex
- W3039891053
- Cited by
- 28
- References
- 43
- Citations by year
- 2025: 4 · 2024: 7 · 2023: 5 · 2022: 8 · 2021: 3 · 2020: 1
- FWCI
- 4.17
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- ACS Omega (publishedVersion, other-oa)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- The Japan Society of Applied Physics
- Funders
- Japan Society for the Promotion of Science (JP19K05248)
- Topics
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Rare-earth and actinide compounds
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
- Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Iron-based superconductors research
- Keywords
- single crystal growth, mixed-valence cerium, superconducting transition temperature, superconducting anisotropy, c-axis lattice constant, lanthanum, cerium, praseodymium, neodymium, samarium
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