SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 4: Focus Session: Correlated van-der-Waals Magnets
TT 4.8: Vortrag
Montag, 27. September 2021, 16:00–16:15, H7
Magnetic- and structural properties of α-RuCl3 under hydrostatic He-gas pressure — •Bernd Wolf1, Anja Wolter-Giraud3, Gael Bastien3, Anna Isaeva4, David Kaib2, Aleksandar Razpop2, Kira Riedl2, Sananda Biswas2, Roser Valentí2, Bernd Büchner3, and Michael Lang1 — 1Physikalisches Institut, GU, SFB/TR 288, D-60438 Frankfurt (M) — 2Institut für theoretische Physik, GU, SFB/TR 288, D-60438 Frankfurt (M) — 3Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, 01171 Dresden, Germany — 4Fakultät für Chemie und Lebensmittelchemie, TUD, 01062 Dresden, Germany
α-RuCl3 is a material to probe fundamental aspects of Kitaev physics despite the occurrence of magnetic order at low temperatures. We followed the idea that the suppression of magnetic order in α-RuCl3 by using external parameters like magnetic field or pressure gives rise to a range where Kitaev physics prevails. We present magnetic susceptibility measurements on α-RuCl3 single crystals under almost ideal hydrostatic pressure conditions. We find that the susceptibility strongly increases with increasing pressure. Furthermore, the magnetic ordering temperature TN becomes rapidly reduced with pressure but cannot be fully suppressed to TN = 0 due to the occurrence of a pressure-induced dimerization transition. We explain both results microscopically by employing a combination of first principles and finite-temperature Lanczos methods. Importantly, thorough investigations of the experimentally observed magnetic transition at varying pressure and magnetic fields reveal clear indications for a first order transition.