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원자제어 저차원 전자계 연구단
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Proximate ferromagnetic state in the Kitaev model material α-RuCl3

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Title
Proximate ferromagnetic state in the Kitaev model material α-RuCl3
Author(s)
Suzuki, H.; Liu, H.; Bertinshaw, J.; Ueda, K.; H. Kim; Laha, S.; Weber, D.; Yang, Z.; Wang, L.; Takahashi, H.; Fursich, K.; Minola, M.; Lotsch, B.V.; Bum Joon Kim; Yavas, H.; Daghofer, M.; Chaloupka, J.; Khaliullin, G.; Gretarsson, H.; Keimer, B.
Publication Date
2021-07
Journal
NATURE COMMUNICATIONS, v.12, no.1
Publisher
Nature Research
Abstract
© 2021, The Author(s).α-RuCl3 is a major candidate for the realization of the Kitaev quantum spin liquid, but its zigzag antiferromagnetic order at low temperatures indicates deviations from the Kitaev model. We have quantified the spin Hamiltonian of α-RuCl3 by a resonant inelastic x-ray scattering study at the Ru L3 absorption edge. In the paramagnetic state, the quasi-elastic intensity of magnetic excitations has a broad maximum around the zone center without any local maxima at the zigzag magnetic Bragg wavevectors. This finding implies that the zigzag order is fragile and readily destabilized by competing ferromagnetic correlations. The classical ground state of the experimentally determined Hamiltonian is actually ferromagnetic. The zigzag state is stabilized by quantum fluctuations, leaving ferromagnetism – along with the Kitaev spin liquid – as energetically proximate metastable states. The three closely competing states and their collective excitations hold the key to the theoretical understanding of the unusual properties of α-RuCl3 in magnetic fields.
URI
https://pr.ibs.re.kr/handle/8788114/10598
DOI
10.1038/s41467-021-24722-4
ISSN
2041-1723
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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