Low-Temperature Chiral Crystal Structure and Superconductivity in (Pt0.2Ir0.8)₃Zr₅

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We report the observation of superconductivity in (Pt 0.2 Ir 0.8 ) 3 Zr 5 with a chiral space group ( P 6 1 22) at low temperatures. The bulk nature of the superconductivity at a transition temperature of 2.2 K was confirmed using specific heat measurements. We revealed that (Pt 0.2 Ir 0.8 ) 3 Zr 5 obeys the weak-coupling Bardeen–Cooper–Schrieffer model, and the dominant mechanism in the upper critical field is the orbital pair-breaking limit rather than the Pauli–Clogston limit. This indicates that the antisymmetric spin–orbit coupling caused by the chiral crystal structure does not significantly affect the superconductivity of (Pt 0.2 Ir 0.8 ) 3 Zr 5 .