Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 53: Frustrated Magnets - Strong Spin-Orbit Coupling (joint session TT/MA)

TT 53.12: Vortrag

Donnerstag, 4. April 2019, 12:30–12:45, Theater

Excitations in the high magnetic field phase of the putative Kitaev material RuCl₃ — •Anuja Sahasrabudhe¹, Raphael German¹, Thomas C. Keothe¹, Jonathan Buhot², Vladimir Tsurkan³, Alois Loidl³, Petra Becker¹, Markus Grüninger¹, and Paul H.M. van Loosdrecht¹ — ¹Universität zu Köln, II. Physikalisches Institut. — ²Radboud University Nijmegen, HMFL. — ³Universität Augsburg, Institut für Physik.

RuCl₃ is discussed as one of the closest realizations of a J=1/2 Kitaev system on a hexagonal lattice. Yet it shows antiferromagnetic (AF) ordering at low temperature signaling the presence of important interactions in addition to the anisotropic Kitaev interactions. AF order can be suppressed by an external magnetic field. The phase diagram and the behavior in high fields are vividly discussed. Here, we probe the magnetic excitation spectrum of RuCl₃ with Raman spectroscopy in high magnetic fields. The observed high field excitation spectra yield a detailed insight into the nature of the high field phase.