Regensburg 2022 – wissenschaftliches Programm
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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 ns at various angles. By measuring the superconducting lower critical field Hc1(T) in a spherical sample with ac-susceptibility, we obtained the temperature dependence of ns=Hc1(T)/Hc1(0) down to 0.03 Tc. Our results show that ns(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.