In-plane magnetic penetration depth in Sr$_2$RuO$_4$: muon-spin rotation/relaxation study
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866917591033839616 |
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| author | Khasanov, Rustem Ramires, Aline Grinenko, Vadim Shipulin, Ilya Kikugawa, Naoki Sokolov, D. A. Maeno, Yoshiteru Luetkens, Hubertus Guguchia, Zurab |
| author_facet | Khasanov, Rustem Ramires, Aline Grinenko, Vadim Shipulin, Ilya Kikugawa, Naoki Sokolov, D. A. Maeno, Yoshiteru Luetkens, Hubertus Guguchia, Zurab |
| contents | We report on measurements of the in-plane magnetic penetration depth ($λ_{\rm ab}$) in single crystals of Sr$_2$RuO$_4$ down to $\simeq 0.015$ K by means of muon-spin rotation/relaxation. The linear temperature dependence of $λ^{-2}_{\rm ab}$ for $T\lesssim 0.7$ K suggests the presence of nodes in the superconducting gap. This statement is further substantiated by observation of the Volovik effect, $i.e.$ the reduction of $λ_{ab}^{-2}$ as a function of the applied magnetic field. The experimental zero-field and zero-temperature value of $λ_{\rm ab}=124(3)$ nm agrees with $λ_{\rm ab}\simeq 130$ nm, calculated based on results of electronic structure measurements reported in [Phys. Rev X 9, 021048 (2019)]. Our analysis reveals that a simple nodal superconducting energy gap, described by the lowest possible harmonic of a gap function, does not capture the dependence of $λ_{\rm ab}^{-2}$ on $T$, so the higher angular harmonics of the energy gap function need to be introduced. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2305_11156 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | In-plane magnetic penetration depth in Sr$_2$RuO$_4$: muon-spin rotation/relaxation study Khasanov, Rustem Ramires, Aline Grinenko, Vadim Shipulin, Ilya Kikugawa, Naoki Sokolov, D. A. Maeno, Yoshiteru Luetkens, Hubertus Guguchia, Zurab Superconductivity We report on measurements of the in-plane magnetic penetration depth ($λ_{\rm ab}$) in single crystals of Sr$_2$RuO$_4$ down to $\simeq 0.015$ K by means of muon-spin rotation/relaxation. The linear temperature dependence of $λ^{-2}_{\rm ab}$ for $T\lesssim 0.7$ K suggests the presence of nodes in the superconducting gap. This statement is further substantiated by observation of the Volovik effect, $i.e.$ the reduction of $λ_{ab}^{-2}$ as a function of the applied magnetic field. The experimental zero-field and zero-temperature value of $λ_{\rm ab}=124(3)$ nm agrees with $λ_{\rm ab}\simeq 130$ nm, calculated based on results of electronic structure measurements reported in [Phys. Rev X 9, 021048 (2019)]. Our analysis reveals that a simple nodal superconducting energy gap, described by the lowest possible harmonic of a gap function, does not capture the dependence of $λ_{\rm ab}^{-2}$ on $T$, so the higher angular harmonics of the energy gap function need to be introduced. |
| title | In-plane magnetic penetration depth in Sr$_2$RuO$_4$: muon-spin rotation/relaxation study |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2305.11156 |