Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 41: Unconventional Superconductors

TT 41.2: Vortrag

Mittwoch, 18. März 2020, 15:30–15:45, HSZ 201

Sr2RuO4 under uniaxial pressure along the c-axis — •Fabian Jerzembeck1, Alexander Steppke1, Dmitry Sokolov1, Naoki Kikugawa2, Helge Rosner1, Andrew Mackenzie1,3, and Clifford Hicks11Max Planck Institute for Chemical Physics of Solids — 2National Institute for Material Science, Tsukuba, Ibaraki — 3School of Physics and Astronomy, University of St. Andrews

The unconventional superconductor Sr2RuO4 has been extensively studied under in-plane uniaxial pressure. a-axis pressure deforms one of the Fermi surfaces elliptically, so that at a compressive strain of εxx = −0.44 %, one of the Fermi surfaces undergoes a Lifshitz transition at a single point in k-space, dramatically altering the low-temperature electronic properties. Here, we investigate the consequences of pressure along the c-axis. c-axis pressure causes charge transfer from the dxz and dyz to the dxy-orbital, resulting in an expansion of the main Fermi surface and finally in Lifshitz transitions at the X and Y points simultaneously. DFT calculations suggest that this occurs at εzz ≈ −2.5 %. We present data for strains up to  −2 %, finding that, surprisingly, Tc decreases even as the density of states increases.

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