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Title: | Evidence for conventional superconductivity in Bi2 PdPt and prediction of possible topological superconductivity in disorder-free γ-BiPd |
Authors: | Sharma, S. GHARA, A. et al. Dept. of Physics |
Keywords: | Physics 2024 2024-AUG-WEEK1 TOC-AUG-2024 |
Issue Date: | Jun-2024 |
Publisher: | American Physical Society |
Citation: | Physical Review B, 109(22), 224509. |
Abstract: | 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 nontrivial 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. |
URI: | https://doi.org/10.1103/PhysRevB.109.224509 http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/9040 |
ISSN: | 2469-9969 2469-9950 |
Appears in Collections: | JOURNAL ARTICLES |
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