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Disorder-enriched magnetic excitations in the Kitaev quantum spin liquid candidate Na$_2$Co$_2$TeO$_6$

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arxiv 2305.07734 v1 pith:N6ZXTLXP submitted 2023-05-12 cond-mat.str-el

Li Xiang , Ramesh Dhakal , Mykhaylo Ozerov , Yuxuan Jiang , Banasree S. Mou , Andrzej Ozarowski , Qing Huang , Haidong Zhou
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Jiyuan Fang Stephen M. Winter Zhigang Jiang Dmitry Smirnov
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classification cond-mat.str-el
keywords magneticexcitationsspindisorderkitaevliquidmodesquantum
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abstract

Using optical magneto-spectroscopy, we investigate the magnetic excitations of Na$_2$Co$_2$TeO$_6$ in a broad magnetic field range ($0\ \rm{T}\leq B\leq 17.5\ \rm{T}$) 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 \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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