Disorder-enriched magnetic excitations in the Kitaev quantum spin liquid candidate Na2Co2TeO6
Abstract
Using optical magneto-spectroscopy, we investigate the magnetic excitations of Na2Co2TeO6 in a broad magnetic field range (0\ T≤ B≤ 17.5\ T) 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 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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