Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 41: Unconventional Superconductors

TT 41.8: Vortrag

Mittwoch, 18. März 2020, 17:15–17:30, HSZ 201

Spiral magnetic order in high-Tc cuprates - a ground state candidate at high magnetic fields — •Johannes Mitscherling, Pietro Maria Bonetti, Demetrio Vilardi, and Walter Metzner — Max Planck Institute for Solid State Research, Stuttgart

The normal state beneath the superconducting dome determines the fluctuations that govern the anomalous properties of cuprate superconductors in a wide range of their phase diagram. Recent experiments at very high magnetic fields shed new light on the phenomenology of the high field ground state: A drastic change in the carrier density at the onset of the pseudogap observed in various cuprate compounds, thermodynamic signatures of a quantum critical point at this doping and, very recently, NMR and ultrasound experiments indicated glassy antiferromagnetic order up to the pseudogap onset.

We present incommensurate spiral magnetic order as a potential ground state candidate at high magnetic fields [1,2]. Previous theoretical work suggests that suppression of superconductivity leads to such a ground state [3]. We present quantitative results for magnetic order in the Hubbard model at strong coupling using dynamical mean-field theory [4]. We show that experimental signatures as the Fermi arcs, nematicity and a drastic drop in both the DC conductivity and the Hall number can be understood within this framework.

[1] A. Eberlein et al., PRL 117, 187001 (2016)

[2] J. Mitscherling et al., PRB 98, 195126 (2018)

[3] H. Yamase et al., PRL 116, 096402 (2016)

[4] P. M. Bonetti et al., arXiv:2002.02786 (2020)

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