Disorder-enriched magnetic excitations in the Kitaev quantum spin liquid candidate Na₂Co₂TeO₆

2023/05/12 by Xiang, Li, Dhakal, Ramesh, Ozerov, Mykhaylo +9
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el)

paper · doi:10.48550/arxiv.2305.07734

Abstract

Using optical magneto-spectroscopy, we investigate the magnetic excitations of Na₂Co₂TeO₆ in a broad magnetic field range (0 \rmT≤ B≤ 17.5 \rmT) at low temperature. Our measurements reveal rich spectra of in-plane magnetic excitations with a surprisingly large number of modes, even in the high-field spin-polarized state. Theoretical calculations find that the Na-occupation disorder in \NCTO plays a crucial role in generating these modes. Our work demonstrates the necessity to consider disorder in the spin environment in the search for Kitaev quantum spin liquid states in practicable materials.

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