Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 49: Poster Session: Superconductivity

TT 49.26: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

Phase separation and proximity effects in itinerant ferromagnet/ superconductor heterostructures — •Christian Martens¹, Andreas Bill², and Götz Seibold¹ — ¹Institut für Physik, BTU Cottbus-Senftenberg, Postfach 101344, 03013 Cottbus, Germany — ²Department of Physics and Astronomy, California State University, Long Beach, California 90840, USA

Heterostructures made of itinerant ferromagnets and superconductors are studied. In contrast to most previous models, ferromagnetism is not enforced by an effective Zeeman field but induced in a correlated single-band model (CSBM) that displays itinerant ferromagnetism as a mean-field ground state. In this model superconductivity and magnetism are both calculated self-consistently. We calculate the magnitude of the magnetization, the superconducting correlations, and variations of the charge density self-consistently for a superconductingmagnetic bilayer by solving the Bogoliubov-de Gennes equations on a two-dimensional lattice. We determine all three quantities as a function of the Coulomb repulsion U and the ferromagnetic exchange interaction J. The CSBM displays a variety of features not present in the Zeeman exchange model-for example, the occurrence of electronic phase separation and the competition of magnetic and superconducting orders far away from the interface.