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TT: Fachverband Tiefe Temperaturen

TT 48: Superconductivity: Heterostructures, Andreev Scattering, Proximity Effect, Vortices

TT 48.4: Talk

Friday, March 30, 2012, 10:15–10:30, H 2053

Superconductivity and Magnetism in the presence of interface-induced Rashba spin-orbit coupling — •Florian Loder, Arno P. Kampf, and Thilo Kopp — Zentrum für Elektronische Korrelationen und Magnetismus, Institut für Physik, Universität Augsburg, Deutschland

Two dimensional electron systems at oxide interfaces are often influenced by a Rashba type spin-orbit coupling (SOC), which is tunable by a transverse electric field. Ferromagnetism at the interface can simultaneously induce strong local magnetic fields. This combination of SOC and magnetism leads to anisotropic two-sheeted Fermi surfaces, on which superconductivity with finite-momentum pairing is favored. The superconducting order parameter is derived within a generalized pairing model realizing both, the FFLO superconductor in the limit of vanishing SOC and a mixed-parity pairing state with zero pair momentum if the magnetism vanishes. The nature of the pairing state is discussed in the context of interface superconductivity and ferromagnetism at LAO-STO interfaces [1,2].
Lu Li, C. Richter, J. Mannhart, and R. C. Ashoori, Nature Physics 7, 762 (2011).
J. A. Bert, B. Kallisky, C. Bell, M. Kim, Y. Hikita, H. Y. Hwang, and K. A. Moler, Nature Physics 7, 767 (2011).