Observation of the Non-linear Meissner Effect
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arXiv
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| Autores principales: | , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2020
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| author | Wilcox, J. A. Grant, M. J. Malone, L. Putzke, C. Kaczorowski, D. Wolf, T. Hardy, F. Meingast, C. Analytis, J. G. Chu, J. -H. Fisher, I. R. Carrington, A. |
| author_facet | Wilcox, J. A. Grant, M. J. Malone, L. Putzke, C. Kaczorowski, D. Wolf, T. Hardy, F. Meingast, C. Analytis, J. G. Chu, J. -H. Fisher, I. R. Carrington, A. |
| contents | A long-standing theoretical prediction is that in clean, nodal unconventional superconductors the magnetic penetration depth $λ$, at zero temperature, varies linearly with magnetic field. This non-linear Meissner effect is an equally important manifestation of the nodal state as the well studied linear-in-$T$ dependence of $λ$, but has never been convincingly experimentally observed. Here we present measurements of the nodal superconductors CeCoIn$_5$ and LaFePO which clearly show this non-linear Meissner effect. We further show how the effect of a small dc magnetic field on $λ(T)$ can be used to distinguish gap nodes from non-nodal deep gap minima. Our measurements of KFe$_2$As$_2$ suggest that this material has such a non-nodal state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2008_04050 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Observation of the Non-linear Meissner Effect Wilcox, J. A. Grant, M. J. Malone, L. Putzke, C. Kaczorowski, D. Wolf, T. Hardy, F. Meingast, C. Analytis, J. G. Chu, J. -H. Fisher, I. R. Carrington, A. Superconductivity A long-standing theoretical prediction is that in clean, nodal unconventional superconductors the magnetic penetration depth $λ$, at zero temperature, varies linearly with magnetic field. This non-linear Meissner effect is an equally important manifestation of the nodal state as the well studied linear-in-$T$ dependence of $λ$, but has never been convincingly experimentally observed. Here we present measurements of the nodal superconductors CeCoIn$_5$ and LaFePO which clearly show this non-linear Meissner effect. We further show how the effect of a small dc magnetic field on $λ(T)$ can be used to distinguish gap nodes from non-nodal deep gap minima. Our measurements of KFe$_2$As$_2$ suggest that this material has such a non-nodal state. |
| title | Observation of the Non-linear Meissner Effect |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2008.04050 |