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TT: Fachverband Tiefe Temperaturen
TT 67: Unconventional Superconductors
TT 67.3: Talk
Thursday, March 21, 2024, 10:15–10:30, H 3007
Evidence for vertical line nodes in Sr2RuO4 from nonlocal electrodynamics — •Javier Landaeta1,2, Konstantin Semeniuk2, Joost Aretz2, Ismardo Bonalde3, Jörg Schmalian4, Andrew Mackenzie2, and Elena Hassinger1 — 1Institute of Solid State and Materials Physics, TU Dresden, 01069, Dresden, Germany — 2Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — 3Centro de Física, Instituto Venezolano de Investigaciones Científicas, Caracas 1020-A, Venezuela — 4Institute for Theoretical Condensed Matter Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
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 dependence of the coherence length ξ and the penetration depth λ down to 0.04 Tc. Given the high sample quality, the observed T2 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 of the superconducting gap, while horizontal line nodes cannot account for the observation.
Keywords: Sr2RuO4; Superconducting Order Parameter; Magnetric penetration depth; Unconventional Superconductors; ac-susceptibility