Two-gap superconductivity in the noncentrosymmetric La$_3$Se$_4$ compound
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arXiv
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| Format: | Preprint |
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2024
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| author | Košuth, F. Potomová, N. Pribulová, Z. Kačmarčík, J. Naskar, M. Inosov, D. S. Ash, S. Ganguli, A. K. Šoltýs, J. Cambel, V. Szabó, P. Samuely, P. |
| author_facet | Košuth, F. Potomová, N. Pribulová, Z. Kačmarčík, J. Naskar, M. Inosov, D. S. Ash, S. Ganguli, A. K. Šoltýs, J. Cambel, V. Szabó, P. Samuely, P. |
| contents | Point-contact Andreev reflection spectroscopy at low temperatures and high magnetic fields has been performed on a noncentrosymmetric La$_3$Se$_4$ superconductor with a critical temperature $T_c$ = 8 K. Two superconducting energy gaps $Δ_1$ and $Δ_2$ with $2Δ_{1}/k_{B} T_{c}$ ~ 5.8 and $2Δ_{2}/k_{B} T_{c}$ ~ 2.3, are directly observed in some of the spectra. The temperature and magnetic field effects help to resolve a two-gap structure even on the most frequent spectra where at low temperatures only a single gap is apparent, reflected in a pair of maxima around the zero bias. Two-gap superconductivity consistently with the point contact Andreev reflection spectroscopy is also supported by the heat capacity and the Hall probe magnetization measurements. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_16399 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Two-gap superconductivity in the noncentrosymmetric La$_3$Se$_4$ compound Košuth, F. Potomová, N. Pribulová, Z. Kačmarčík, J. Naskar, M. Inosov, D. S. Ash, S. Ganguli, A. K. Šoltýs, J. Cambel, V. Szabó, P. Samuely, P. Superconductivity Point-contact Andreev reflection spectroscopy at low temperatures and high magnetic fields has been performed on a noncentrosymmetric La$_3$Se$_4$ superconductor with a critical temperature $T_c$ = 8 K. Two superconducting energy gaps $Δ_1$ and $Δ_2$ with $2Δ_{1}/k_{B} T_{c}$ ~ 5.8 and $2Δ_{2}/k_{B} T_{c}$ ~ 2.3, are directly observed in some of the spectra. The temperature and magnetic field effects help to resolve a two-gap structure even on the most frequent spectra where at low temperatures only a single gap is apparent, reflected in a pair of maxima around the zero bias. Two-gap superconductivity consistently with the point contact Andreev reflection spectroscopy is also supported by the heat capacity and the Hall probe magnetization measurements. |
| title | Two-gap superconductivity in the noncentrosymmetric La$_3$Se$_4$ compound |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2411.16399 |