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By determining the superconducting lower and upper critical fields Hc1(T) and Hc2(T), respectively, in a high-purity spherical Sr2RuO4 sample via ac-susceptibility measurements, we obtain the temperature depen- dence of the coherence length 𝜉 and the penetration depth λ down to 0.04xTc . Given the high sample quality, the observed T^2 dependence of λ at low temperatures cannot be explained in terms of impurity effects. Instead, we argue that the weak type-II superconductor Sr2RuO4 has to be treated in the non-local limit. In that limit, the penetration depth data agree with a gap structure having vertical line nodes, while horizontal line nodes cannot account for the observation.

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• Creative Commons BY Attribution 4.0 International
  

Keyword: Sr2RuO4, superconducting node, nonlocal electrodynamics

Date published: 2024-09-17

Publisher: American Physical Society (APS)

Journal:

• Physical Review B (ISSN: 24699950) vol. 110 issue. 10 L100503

Funding:

• Deutsche Forschungsgemeinschaft CRC 1143-247310070
• Deutsche Forschungsgemeinschaft 390858490
• Deutsche Forschungsgemeinschaft CRC 288-422213477
• Japan Society for the Promotion of Science JP21H01033
• Japan Society for the Promotion of Science JP22H01168
• Japan Society for the Promotion of Science JP22K19093
• National Science Foundation NSF PHY1748958
• National Science Foundation NSF PHY-2309135
• Deutsche Forschungsgemeinschaft A07
• Deutsche Forschungsgemeinschaft A10
• Japan Society for the Promotion of Science JP18K04715

Manuscript type: Author's version (Accepted manuscript)

MDR DOI:

First published URL: https://doi.org/10.1103/physrevb.110.l100503

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Updated at: 2024-10-01 12:30:14 +0900

Published on MDR: 2024-10-01 12:30:15 +0900