Atypical vortex lattice and the magnetic penetration depth in superconducting Sr$_2$RuO$_4$ deduced by $μ$SR
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909465657212928 |
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| author | Yakovlev, M. Kartsonas, Z. Sonier, J. E. |
| author_facet | Yakovlev, M. Kartsonas, Z. Sonier, J. E. |
| contents | The muon spin rotation ($μ$SR) technique has been applied to determine the behavior of the in-plane magnetic penetration depth ($λ_{ab}$) in the vortex state of the unconventional superconductor Sr$_2$RuO$_4$ as a means of gaining insight into its still unknown superconducting order parameter. A recent $μ$SR study of Sr$_2$RuO$_4$ reported a $T$-linear temperature dependence for $λ_{ab}$ at low temperatures that was not identified in an earlier $μ$SR study. Here we show that there is no significant difference between the data in the early and recent $μ$SR studies and both are compatible with the limiting low-temperature $λ_{ab} \sim T^2$ dependence expected from measurements of the change in $λ_{ab}(T)$ in the Meissner state by other techniques. However, we argue that at this time there is no valid theoretical model for reliably determining the absolute value of $λ_{ab}$ in Sr$_2$RuO$_4$ from $μ$SR measurements. Instead, we identify the formation of an unusual square vortex lattice that introduces a new constraint on candidate superconducting order parameters for Sr$_2$RuO$_4$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_14876 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Atypical vortex lattice and the magnetic penetration depth in superconducting Sr$_2$RuO$_4$ deduced by $μ$SR Yakovlev, M. Kartsonas, Z. Sonier, J. E. Superconductivity The muon spin rotation ($μ$SR) technique has been applied to determine the behavior of the in-plane magnetic penetration depth ($λ_{ab}$) in the vortex state of the unconventional superconductor Sr$_2$RuO$_4$ as a means of gaining insight into its still unknown superconducting order parameter. A recent $μ$SR study of Sr$_2$RuO$_4$ reported a $T$-linear temperature dependence for $λ_{ab}$ at low temperatures that was not identified in an earlier $μ$SR study. Here we show that there is no significant difference between the data in the early and recent $μ$SR studies and both are compatible with the limiting low-temperature $λ_{ab} \sim T^2$ dependence expected from measurements of the change in $λ_{ab}(T)$ in the Meissner state by other techniques. However, we argue that at this time there is no valid theoretical model for reliably determining the absolute value of $λ_{ab}$ in Sr$_2$RuO$_4$ from $μ$SR measurements. Instead, we identify the formation of an unusual square vortex lattice that introduces a new constraint on candidate superconducting order parameters for Sr$_2$RuO$_4$. |
| title | Atypical vortex lattice and the magnetic penetration depth in superconducting Sr$_2$RuO$_4$ deduced by $μ$SR |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2501.14876 |