SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Ruthenates

TT 37.8: Vortrag

Mittwoch, 29. März 2023, 17:00–17:15, HSZ 201

Non-local electrodynamics and field angle dependence of the superfluid density in Sr₂RuO₂ — •Javier Landaeta¹, Konstantin Semeniuk¹, Joost Aretz¹, Ismardo Bonalde², and Elena Hassinger¹ — ¹Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — ²Centro de Física, Instituto Venezolano de Investigaciones Científicas, Caracas 1020-A, Venezuela

Although being extensively studied for more than 25 years, the nature of the superconducting order parameter (SOP) of the weak type II superconductor Sr₂RuO₄ is still strongly debated. To get insight into the nodal structure of the SOP, we carried out a comprehensive study of the temperature dependence of the superfluid density n_s at various field orientations. By measuring the superconducting lower critical field H_c1(T) in a spherical sample with ac-susceptibility, we obtained the temperature dependence of n_s=H_c1(T)/H_c1(0) down to 0.03 T_c. Our results show that follows a low-temperature power law of T² up to 0.7T_c irrespective of the field angle. The observed behavior is in excellent agreement with what is expected of a type II superconductor with vertical nodes, with a strong influence of non-local electrodynamics. The discussed mechanisms are highly relevant for all weak type II superconductors.