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Evidence for vertical line nodes in Sr2RuO4 from nonlocal electrodynamics
MDR Open Deposited
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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- 17/09/2024
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