The two critical temperatures conundrum in La$_{1.83}$Sr$_{0.17}$CuO$_4$
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866916273521164288 |
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| author | Samanta, Abhisek Mangel, Itay Keren, Amit Arovas, Daniel P. Auerbach, Assa |
| author_facet | Samanta, Abhisek Mangel, Itay Keren, Amit Arovas, Daniel P. Auerbach, Assa |
| contents | The in-plane and out-of-plane superconducting stiffness of LSCO rings appear to vanish at different transition temperatures, which contradicts thermodynamical expectation. In addition, we observe a surprisingly strong dependence of the out-of-plane stiffness transition on sample width. With evidence from Monte Carlo simulations, this effect is explained by very small ratio $α$ of interplane over intraplane superconducting stiffnesses. For three dimensional rings of millimeter dimensions, a crossover from layered three dimensional to quasi one dimensional behavior occurs at temperatures near the thermodynamic transition temperature $T_{\rm c}$, and the out of-plane stiffness appears to vanish below $T_{\rm c}$ by a temperature shift of order $αL_a/ξ^\parallel$, where $L_a/ξ^\parallel$ is the sample's width over coherence length. Including the effects of layer-correlated disorder, the measured temperature shifts can be fit by $α=4.1\times 10^{-5}$ near $T_{\rm c}$, which is significantly lower than its previously measured value near zero temperature. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2308_15540 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The two critical temperatures conundrum in La$_{1.83}$Sr$_{0.17}$CuO$_4$ Samanta, Abhisek Mangel, Itay Keren, Amit Arovas, Daniel P. Auerbach, Assa Superconductivity The in-plane and out-of-plane superconducting stiffness of LSCO rings appear to vanish at different transition temperatures, which contradicts thermodynamical expectation. In addition, we observe a surprisingly strong dependence of the out-of-plane stiffness transition on sample width. With evidence from Monte Carlo simulations, this effect is explained by very small ratio $α$ of interplane over intraplane superconducting stiffnesses. For three dimensional rings of millimeter dimensions, a crossover from layered three dimensional to quasi one dimensional behavior occurs at temperatures near the thermodynamic transition temperature $T_{\rm c}$, and the out of-plane stiffness appears to vanish below $T_{\rm c}$ by a temperature shift of order $αL_a/ξ^\parallel$, where $L_a/ξ^\parallel$ is the sample's width over coherence length. Including the effects of layer-correlated disorder, the measured temperature shifts can be fit by $α=4.1\times 10^{-5}$ near $T_{\rm c}$, which is significantly lower than its previously measured value near zero temperature. |
| title | The two critical temperatures conundrum in La$_{1.83}$Sr$_{0.17}$CuO$_4$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2308.15540 |