2024/03/27 by Sharma, S., Richards, A. D. S., P., Sajilesh K. +13
#FOS: Physical sciences #Superconductivity (cond-mat.supr-con)
paper · doi:10.48550/arxiv.2403.18244
We present comprehensive investigations into the structural, superconducting, and topological properties of Bi2PdPt. Magnetization and heat capacity measurements performed on polycrystalline Bi2PdPt demonstrate a superconducting transition at ≈ 0.8 K. Moreover, muon spin relaxation/rotation (μSR) measurements present evidence for a time reversal symmetry preserving, isotropically gapped superconducting state in Bi2PdPt. We have also performed density-functional theory (DFT) calculations on Bi2PdPt alongside the more general isostructural systems, BiPdxPt1-x, of which Bi2PdPt and γ-BiPd are special cases for x=0.5 and x=1 respectively. We have calculated the Z2 topological index from our DFT calculations for a range of substitution fractions, x, between x=0 and x=1 characterizing the topology of the band structure. We find a non-trivial topological state when x>0.75 and a trivial topological state when x<0.75. Therefore our results indicate that BiPdxPt1-x could be a topological superconductor for x>0.75.