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Yoo, Jung-Woo
Nano Spin Transport Lab.
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Honeycomb oxide heterostructure as a candidate host for a Kitaev quantum spin liquid

Author(s)
Kang, BaekjunePark, MijuSong, SehwanNoh, SeunghyeonChoe, DaeseongKong, MinsikKim, MinjaeSeo, ChoongwonKo, Eun KyoYi, GangsanYoo, Jung-WooPark, SungkyunOk, Jong MokSohn, Chang Hee
Issued Date
2023-02
DOI
10.1103/physrevb.107.075103
URI
https://scholarworks.unist.ac.kr/handle/201301/62257
Citation
PHYSICAL REVIEW B, v.107, no.7, pp.075103
Abstract
The Kitaev quantum spin liquidand massively quantum entangled states, are so scarce in nature that searching for new candidate systems remains a great challenge. A honeycomb heterostructure could be a promising route to realize and utilize such an exotic quantum phase by providing additional controllability of Hamiltonian and device compatibility, respectively. Here, we provide epitaxial honeycomb oxide thin film Na3Co2SbO6, a candidate of Kitaev quantum spin liquid proposed recently. We found a spin glass and antiferromagnetic ground states depending on Na stoichiometry, signifying not only the importance of Na vacancy control but also strong frustration in Na3Co2SbO6. Despite its classical ground state, the field-dependent magnetic susceptibility shows remarkable scaling collapse with a single critical exponent, which can be interpreted as evidence of quantum criticality. Its electronic ground state and derived spin Hamiltonian from optical spectroscopy are consistent with the predicted Kitaev model. Our work provides a unique route to the realization and utilization of Kitaev quantum spin liquid.
Publisher
AMER PHYSICAL SOC
ISSN
2469-9950
Keyword
MAGNETIC-PROPERTIESFIELDANYONS

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