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TT: Fachverband Tiefe Temperaturen

TT 23: Superconductivity: Fe-based Superconductors - Fe(Se/Te)

TT 23.7: Talk

Wednesday, March 28, 2012, 11:00–11:15, H 2053

Paramagnons in FeSe close to Magnetic Phase Transition — •Leonid Sandratskii, Frank Essenberger, Pawel Buczek, Arthur Ernst, and Eberhard Gross — Max-Planck-Institut für Mikrostrukturphysik, Halle

The magnetic excitations in FeSe are studied from first principles applying linear response density functional theory. The position of the selenide layer is varied to model the transition between paramagnetic and antiferromagnetic phases. In the paramagnetic phase, close to the point of magnetic instability we find a branch of long lived collective spin excitations, paramagnons. The phase transition to the AFM phase changes the character of the spin excitations drastically.