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TT: Fachverband Tiefe Temperaturen

TT 14: Superconductivity: Theory 1

TT 14.1: Hauptvortrag

Montag, 16. März 2020, 15:00–15:30, HSZ 204

Magnetotransport and 2D Superconductivity in Heterostructures of BaBiO₃ and BaPbO₃ — •German Hammerl — Experimental Physics VI, Center for Electronic Correlations an Magnetism, Institute of Physics, University of Augsburg, Germany

Perowskite-related BaBiO₃ is fascinating as it acts like a charge-density wave ordered insulator which becomes superconducing if homogeneously doped by, e. g., lead or potassium [1]. Furthermore it is theoretically predicted to be a topological insulator if electron or hole doped [2]. In this talk I will give an overview on this material and especially show that heterostructures of BaBiO₃ and BaPbO₃ show 2D superconductivity in agreement with a Berezinskiĭ-Kosterlitz-Thouless transition [3]. Temperature- and magnetic field-dependent sheet resistances are strongly affected by 2D quantum effects. Our analysis decodes the interplay of spin-orbit coupling, disorder and electron-electron interaction in this material [4].

[1] A. W. Sleight, Phys. C 514, 152 (2015).

[2] B. Yan, M. Jansen, and C. Felser, Nat. Phys. 9, 709 (2013).

[3] B. Meir, S. Gorol, T. Kopp, and G. Hammerl, Phys. Rev. B. 96, 100507(R) (2017).

[4] P. Seiler, R. Bartel, T. Kopp, and G. Hammerl, Phys. Rev. B 100, 165402 (2019).