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TT: Fachverband Tiefe Temperaturen

TT 72: Poster Session: Correlated Electrons

TT 72.23: Poster

Mittwoch, 14. März 2018, 15:00–19:00, Poster B

High-field ESR studies of the honeycomb-lattice material α-RuCl₃ — •Alexey N. Ponomaryov¹, E. Schulze^1,2, J. Wosnitza^1,2, P. Lampen-Kelley^3,4, A. Banerjee³, J.Q. Yan³, C.A. Bridges³, D.G. Mandrus³, S.E. Nagler³, A.K. Kolezhuk⁵, and S.A. Zvyagin¹ — ¹Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Germany — ²TU Dresden, Germany — ³Oak Ridge National Laboratory, Oak Ridge, TN, USA — ⁴University of Tennessee, Knoxville, TN, USA — ⁵T. Shevchenko National University of Kyiv, Ukraine

We present high-field electron spin resonance (ESR) studies of the honeycomb-lattice material α-RuCl₃, a prime candidate to exhibit Kitaev physics. Two modes of antiferromagnetic resonance were detected in the zigzag ordered phase, with magnetic field applied in the ab plane. A very rich excitation spectrum was observed in the field-induced quantum paramagnetic phase. The obtained data are compared with results of recent numerical calculations, strongly suggesting a very unconventional multiparticle character of the spin dynamics in α-RuCl₃. The frequency-field diagram of the lowest-energy ESR mode is found consistent with the behavior of the field-induced energy gap, revealed by thermodynamic measurements.

This work was supported by DFG (project ZV 6/2-2).