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TT: Fachverband Tiefe Temperaturen

TT 21: Focus Session: Nematicity, Magnetism and Superconductivity in FeSe and Related Compounds

TT 21.3: Invited Talk

Tuesday, March 21, 2017, 10:30–11:00, HSZ 03

Frustrated Magnetism and Electron-Electron Interactions in FeSe — •Roser Valenti — Goethe University Frankfurt, Germany

The temperature-pressure phase diagram of bulk FeSe continues to fascinate a large fraction of researchers working on unconventional superconductivity. In this talk, we will discuss this phase diagram from a first principles prespective. We will show that the magnetic interactions in chalcogenides, as opposed to pnictides, demonstrate unusual frustration, which suppresses magnetic, but not nematic order, favors orbital order in the nematic phase and can naturally explain the nonmonotonic pressure dependence of the superconducting critical temperature. Furthermore we will argue on the importance of electron-electron interactions in FeSe and compare our results based on a combined first principles with many-body methods study with available recent experimental results.