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Barium-rhodium silicide BaRhSi2 has been successfully synthesized using a high-pressure technique at 6GPa. X-ray Rietveld analysis and scanning transmission electron microscopy studies revealed that BaRhSi2 is isostructural to BaIrSi2, within the noncentrosymmetric space group C2221 with the lattice parameters: a = 14.9777(1) Å, b = 8.0517(1) Å and c = 8.0551(1) Å. Electrical resistivity, magnetic moment, and specific heat measurements indicate that BaRhSi2 is a type-II superconductor with a critical temperature Tc ~ 5.1 K, an upper critical field Hc2(0) ~ 32 kOe and a Ginzburg-Landau parameter kGL ~ 56. The superconductivity is a Bardeen-Cooper-Schrieffer (BCS)-like state with moderate electron-phonon coupling lep ~ 0.6 and weak electron correlation lee ~ 0.1. Phonon mediation seems to be dominant for the Cooper pairing. The ab initio calculations revealed that BaRhSi2 has three pairs of Fermi surfaces split by spin-orbit coupling. The band splitting energy is around DASO ~ 0.03 eV near EF, which is rather smaller than that (~ 0.07 eV) in BaIrSi2.

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• In Copyright
  

  ©2026 American Physical Society

Keyword: Superconductivity, Superconductor, BaRhSi2, High-pressure synthesis

Date published: 2026-04-27

Publisher: American Physical Society (APS)

Journal:

• Physical Review B (ISSN: 24699950) vol. 113 issue. 13 134525

Funding:

• National Institute for Materials Science
• Japan Society for the Promotion of Science 16K06712
• Japan Society for the Promotion of Science 19K03755

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6270

First published URL: https://doi.org/10.1103/rx78-l97k

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Updated at: 2026-05-01 08:49:51 +0900

Published on MDR: 2026-05-01 12:23:36 +0900