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TT: Fachverband Tiefe Temperaturen

TT 22: Unconventional Superconductors

TT 22.3: Vortrag

Mittwoch, 7. September 2022, 15:45–16:00, H10

Angular dependence of superfluid density in Sr₂RuO₄ — •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 Sr₂RuO₄ is still debated. In recent years, experimental evidence revealed the possibility of two component SOPs. These results constrain the SOP to only a few allowed symmetries. To get insight on the nodal structure of the SOP, we carried out a comprehensive study of the temperature dependence of the superfluid density n_s at various angles. 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 n_s(T) is identical for all the studied angles showing a low temperature power law of T², which rules out the possibility of horizontal line nodes in Sr₂RuO₄. These results impose strong constraints over the remaining allowed symmetries for SOPs.