Evidence for conventional superconductivity in Bi2PdPt and prediction of possible topological superconductivity in disorder-free γ−BiPd
S. Sharma, A. D. S. Richards, Sajilesh K. P., A. Kataria, B. S. Agboola, M. Pula, J. Gautreau, A. Ghara, D. Singh, S. Marik, S. R. Dunsiger, M. J. Lagos, A. Kanigel, E. S. Sørensen, R. P. Singh, G. M. Luke
DOI 10.1103/PhysRevB.109.224509 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2PdPt Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.8 | Pressure not reported | onset |
| Bi2PdPt Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.8 | Pressure not reported | midpoint |
| Bi2PdPt Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.75 | Pressure not reported | unknown |
| BiPd Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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