Superconductivity in BaIrSi2: A 5d electron system with a noncentrosymmetric crystal structure

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

doi:10.1103/PhysRevB.99.054514

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Superconductivity in BaIrSi2: A 5d electron system with a noncentrosymmetric crystal structure

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

DOI 10.1103/PhysRevB.99.054514 · Physical Review B

T1

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Abstract

The compound BaIrSi2 was successfully synthesized under high pressure at 6 GPa. BaIrSi2 crystalizes in an orthorhombic symmetry with the noncentrosymmetric space group C2221 and the lattice parameters a=15.0492(1)Å, b=8.0311(1)Å, and c=8.0314(1)Å. BaIrSi2 shows superconductivity below a critical temperature Tc∼6K and an upper critical field μ0Hc2(0)∼6T with a Ginzburg-Landau parameter κGL∼87. Specific-heat measurements suggest that BaIrSi2 is an intermediate-coupling superconductor with a moderate electron-phonon coupling constant λep∼0.8. The Sommerfeld constant is γn∼5.5mJ/moleK2. Phonon mediation seems to be dominant for Cooper pairing in BaIrSi2. The ab initio calculations revealed that BaIrSi2 has four Fermi surfaces split by spin-orbit coupling. The Cooper pairing seems to occur between electrons without spin degeneracy.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
BaIrSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6	Pressure unresolved	unknown
BaIrSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6	Pressure unresolved	unknown
BaIrSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6	Pressure unresolved	unknown
CePt3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1	Pressure not reported	unknown
CeRhSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CeIrSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CeCoGe3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
UIr Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown