Evidence for conventional superconductivity in Bi$_2$PdPt and prediction of topological superconductivity in disorder-free $γ$-BiPd
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| Autores principales: | , , , , , , , , , , , , , , , |
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2024
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| author | Sharma, S. Richards, A. D. S. P., Sajilesh K. Kataria, A. Agboola, B. S. Pula, M. Gautreau, J. Ghara, A. Singh, D. Marik, S. Dunsiger, S. R. Lagos, M. J. Kanigel, A. Sørensen, E. S. Singh, R. P. Luke, G. M. |
| author_facet | Sharma, S. Richards, A. D. S. P., Sajilesh K. Kataria, A. Agboola, B. S. Pula, M. Gautreau, J. Ghara, A. Singh, D. Marik, S. Dunsiger, S. R. Lagos, M. J. Kanigel, A. Sørensen, E. S. Singh, R. P. Luke, G. M. |
| contents | We present comprehensive investigations into the structural, superconducting, and topological properties of Bi$_2$PdPt. Magnetization and heat capacity measurements performed on polycrystalline Bi$_2$PdPt demonstrate a superconducting transition at $\approx$ 0.8 K. Moreover, muon spin relaxation/rotation ($μ$SR) measurements present evidence for a time reversal symmetry preserving, isotropically gapped superconducting state in Bi$_2$PdPt. We have also performed density-functional theory (DFT) calculations on Bi$_2$PdPt alongside the more general isostructural systems, BiPd$_{x}$Pt$_{1-x}$, of which Bi$_2$PdPt and $γ$-BiPd are special cases for $x=0.5$ and $x=1$ respectively. We have calculated the $Z_2$ 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 BiPd$_{x}$Pt$_{1-x}$ could be a topological superconductor for $x>0.75$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_18244 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Evidence for conventional superconductivity in Bi$_2$PdPt and prediction of topological superconductivity in disorder-free $γ$-BiPd Sharma, S. Richards, A. D. S. P., Sajilesh K. Kataria, A. Agboola, B. S. Pula, M. Gautreau, J. Ghara, A. Singh, D. Marik, S. Dunsiger, S. R. Lagos, M. J. Kanigel, A. Sørensen, E. S. Singh, R. P. Luke, G. M. Superconductivity We present comprehensive investigations into the structural, superconducting, and topological properties of Bi$_2$PdPt. Magnetization and heat capacity measurements performed on polycrystalline Bi$_2$PdPt demonstrate a superconducting transition at $\approx$ 0.8 K. Moreover, muon spin relaxation/rotation ($μ$SR) measurements present evidence for a time reversal symmetry preserving, isotropically gapped superconducting state in Bi$_2$PdPt. We have also performed density-functional theory (DFT) calculations on Bi$_2$PdPt alongside the more general isostructural systems, BiPd$_{x}$Pt$_{1-x}$, of which Bi$_2$PdPt and $γ$-BiPd are special cases for $x=0.5$ and $x=1$ respectively. We have calculated the $Z_2$ 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 BiPd$_{x}$Pt$_{1-x}$ could be a topological superconductor for $x>0.75$. |
| title | Evidence for conventional superconductivity in Bi$_2$PdPt and prediction of topological superconductivity in disorder-free $γ$-BiPd |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2403.18244 |