In-plane angular dependence of superconducting gaps in FeSe probed by high resolution specific heat measurements
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866917701745639424 |
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| author | Cercellier, H. Olson, K. Schuchard, M. Toulemonde, P. Haghighirad, A. -A. Marcenat, C. Klein, T. |
| author_facet | Cercellier, H. Olson, K. Schuchard, M. Toulemonde, P. Haghighirad, A. -A. Marcenat, C. Klein, T. |
| contents | The influence of a rotating magnetic field (in the $ab-$plane) on the density of states has been investigated in the superconducting state of the nematic FeSe superconductor using high sensitivity specific heat measurements. As expected for (quasi-)nodal superconductors, oscillations in the specific heat ($C$) associated to the Doppler energy shift of Cooper pairs with momenta close to the gap minima are observed. In the $T_c = 9$~K crystal, $C(ϕ$) displays a twofold symmetry at low temperature and low magnetic field confirming the nematic character of FeSe from thermodynamical measurements. As expected, a $π/2$ phase shift is observed for increasing temperatures (at $H=1$~T) but the gap structure abruptly changes above $\sim 1$~K in this sample. At low temperature, the maxima observed for $H||a-$axis at low $H$ split into lobes at $\pm 45^\circ$ when the magnetic field is increased indicating an anomalous field dependence of the gaps. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_15908 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | In-plane angular dependence of superconducting gaps in FeSe probed by high resolution specific heat measurements Cercellier, H. Olson, K. Schuchard, M. Toulemonde, P. Haghighirad, A. -A. Marcenat, C. Klein, T. Superconductivity The influence of a rotating magnetic field (in the $ab-$plane) on the density of states has been investigated in the superconducting state of the nematic FeSe superconductor using high sensitivity specific heat measurements. As expected for (quasi-)nodal superconductors, oscillations in the specific heat ($C$) associated to the Doppler energy shift of Cooper pairs with momenta close to the gap minima are observed. In the $T_c = 9$~K crystal, $C(ϕ$) displays a twofold symmetry at low temperature and low magnetic field confirming the nematic character of FeSe from thermodynamical measurements. As expected, a $π/2$ phase shift is observed for increasing temperatures (at $H=1$~T) but the gap structure abruptly changes above $\sim 1$~K in this sample. At low temperature, the maxima observed for $H||a-$axis at low $H$ split into lobes at $\pm 45^\circ$ when the magnetic field is increased indicating an anomalous field dependence of the gaps. |
| title | In-plane angular dependence of superconducting gaps in FeSe probed by high resolution specific heat measurements |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2406.15908 |