Search for magnetic field expulsion in optically driven K$_3$C$_{60}$
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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_ | 1866909515163631616 |
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| author | De Vecchi, G. Buzzi, M. Jotzu, G. Fava, S. Gebert, T. Magnani, G. Pontiroli, D. Riccò, M. Cavalleri, A. |
| author_facet | De Vecchi, G. Buzzi, M. Jotzu, G. Fava, S. Gebert, T. Magnani, G. Pontiroli, D. Riccò, M. Cavalleri, A. |
| contents | Photoexcited K$_3$C$_{60}$ displays several properties reminiscent of equilibrium superconductivity, including transient optical spectra, pressure dependence, and I-V characteristics. However, these observations do not decisively establish non-equilibrium superconductivity, which would be conclusively evidenced by transient Meissner diamagnetism, as shown recently in driven YBa$_2$Cu$_3$O$_{6.48}$. Here, we search for transient magnetic field expulsion in K$_3$C$_{60}$ by measuring Faraday rotation in a magneto-optic material placed in its vicinity. Unlike in the case of homogeneous, insulating YBa$_2$Cu$_3$O$_{6.48}$, inhomogeneous, metallic K$_3$C$_{60}$ powders reduce the size of the effect. With the $\sim50$ nT magnetic field resolution achieved in our experiments, we provide an upper limit for the photo-induced diamagnetic volume susceptibility ($χ_v>-0.1$). On this basis, we conclude that the photo-induced phase has weaker diamagnetism than superconducting K$_3$C$_{60}$ at zero temperature. Yet, from recent nonlinear transport measurements in this granular material, we expect a light-induced state similar to the equilibrium superconductor near 0.8 T$_c$, for which $χ_v>-0.1$. A definitive conclusion on the presence or absence of Meissner diamagnetism cannot be made for K$_3$C$_{60}$ with the current resolution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_20276 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Search for magnetic field expulsion in optically driven K$_3$C$_{60}$ De Vecchi, G. Buzzi, M. Jotzu, G. Fava, S. Gebert, T. Magnani, G. Pontiroli, D. Riccò, M. Cavalleri, A. Superconductivity Strongly Correlated Electrons Photoexcited K$_3$C$_{60}$ displays several properties reminiscent of equilibrium superconductivity, including transient optical spectra, pressure dependence, and I-V characteristics. However, these observations do not decisively establish non-equilibrium superconductivity, which would be conclusively evidenced by transient Meissner diamagnetism, as shown recently in driven YBa$_2$Cu$_3$O$_{6.48}$. Here, we search for transient magnetic field expulsion in K$_3$C$_{60}$ by measuring Faraday rotation in a magneto-optic material placed in its vicinity. Unlike in the case of homogeneous, insulating YBa$_2$Cu$_3$O$_{6.48}$, inhomogeneous, metallic K$_3$C$_{60}$ powders reduce the size of the effect. With the $\sim50$ nT magnetic field resolution achieved in our experiments, we provide an upper limit for the photo-induced diamagnetic volume susceptibility ($χ_v>-0.1$). On this basis, we conclude that the photo-induced phase has weaker diamagnetism than superconducting K$_3$C$_{60}$ at zero temperature. Yet, from recent nonlinear transport measurements in this granular material, we expect a light-induced state similar to the equilibrium superconductor near 0.8 T$_c$, for which $χ_v>-0.1$. A definitive conclusion on the presence or absence of Meissner diamagnetism cannot be made for K$_3$C$_{60}$ with the current resolution. |
| title | Search for magnetic field expulsion in optically driven K$_3$C$_{60}$ |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2502.20276 |