Noncentrosymmetric superconductor BaRhSi2

Masaaki Isobe; Koji Kimoto; Masao Arai; Taras Kolodiazhnyi; Eiji Takayama-Muromachi

doi:10.1103/rx78-l97k

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Noncentrosymmetric superconductor BaRhSi2

Masaaki Isobe, Koji Kimoto, Masao Arai, Taras Kolodiazhnyi, Eiji Takayama-Muromachi

DOI 10.1103/rx78-l97k · Physical Review B

T1

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Abstract

Barium-rhodium silicide BaRhSi2 has been successfully synthesized using a high-pressure technique at 6 GPa. 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∼5.1K, an upper critical field Hc2(0)∼32 kOe, and a Ginzburg-Landau parameter κGL∼56. The superconductivity is a Bardeen-Cooper-Schrieffer (BCS)-like state with moderate electron-phonon coupling λep∼0.6 and weak electron correlation λee∼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 ΔASO∼0.03 eV near EF, which is rather smaller than that (∼0.07 eV) in BaIrSi2.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
BaRhSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.1	Pressure not reported	unknown
BaRhSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.5	Pressure not reported	onset
BaRhSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.7	Pressure not reported	zero_resistance
BaIrSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6	Pressure not reported	unknown