Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 83: Superconductivity: (General) Theory

TT 83.5: Vortrag

Donnerstag, 15. März 2018, 10:30–10:45, HFT-FT 101

Electromagnetic response of spiral magnetic states in two-dimensional metals — •Johannes Mitscherling and Walter Metzner — Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

The superconductivity and the normal state of cuprates are not yet fully understood. In a seminal paper [1], Badoux et al. suppressed the superconductivity with high magnetic fields making the normal ground state accessible. Varying the doping in YBCO they found a rapid change of the Hall number near optimal doping indicating a Fermi surface reconstruction. A spiral magnetic ground state was shown to be a possible candidate for such a reconstruction [2]. A full treatment of the electromagnetic response for a two-dimensional metal with a spiral magnetic ground state beyond the long lifetime limit is necessary at the relevant experimental temperatures. In a systematic approach we extend the well-known results of Voruganti et al. [3] including all inter-band effects for arbitrary lifetime which leads to corrections to the conductivity and Hall conductivity. We clarify the conditions under which the well-known results are applicable, discuss the relation between the Hall number and the occupation number and apply it to the experiments mentioned above.
Badoux et al., Nature 531, 210 (2016)
Eberlein et al. PRL 117, 187001 (2016)
Voruganti et al., PRB 45, 13945 (1992)