Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Superconductivity: Poster Session

TT 19.9: Poster

Montag, 7. März 2016, 15:00–18:00, Poster D

Spin susceptibility and magnetic instability in Spin-Orbit Coupled system of Sr₂RuO₄ — Sergio Cobo¹, Ilya Eremin², and •Alireza Akbari¹ — ¹Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk 790-784, Korea — ²Theoretische Physik III, Ruhr-Universität Bochum - D-44780, Bochum, Germany

Although the Stronthium Ruthenate compound has been known for more than two decades, there are some major features, which still remain unknown. Mainly, it is still not clear what is the Cooper pairing mechanism and why it can be a triplet superconductor. These features turn out to be even more striking when considering the similarity of its crystal structure and that of the high-T_c cuprates. We analyzed the magnetic response of Sr₂RuO₄ under the presence of a strong spin-orbit coupling interaction. We found very remarkable anisotropies in the different components of the spin susceptibility. This finding strongly suggest that the Cooper instability may be driven by magnetic fluctuations and that spin orbit coupling is much more important than expected in this regard. Furthermore, we think there must be a relation between this interesting behavior and the fact that the stronthium ruthenate chooses the triplet-pairing channel when reaching the superconducting state.