Evidence for field induced quantum spin liquid behavior in a spin-1/2 honeycomb magnet

One of the most important issues in modern condensed matter physics is the realization of fractionalized excitations, such as the Majorana excitations in the Kitaev quantum spin liquid. To this aim, the 3d-based Kitaev material Na2Co2TeO6 is a promising candidate whose magnetic phase diagram of B //...

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Published inarXiv.org
Main Authors Lin, Gaoting, Shu, Mingfang, Zhao, Qirong, Li, Gang, Ma, Yinina, Jiao, Jinlong, Li, Yuting, Duan, Guijing, Huang, Qing, Sheng, Jieming, Kolesnikov, Alexander I, Lu, Li, Wu, Liusuo, Chen, Hongwei, Yu, Rong, Wang, Xiaoqun, Liu, Zhengxin, Zhou, Haidong, Ma, Jie
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 12.09.2024
Subjects
Condensed matter physics
Excitation
Excitation spectra
Inelastic scattering
Magnons
Monte Carlo simulation
Neutron scattering
Phase diagrams
Spin liquid
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Summary:One of the most important issues in modern condensed matter physics is the realization of fractionalized excitations, such as the Majorana excitations in the Kitaev quantum spin liquid. To this aim, the 3d-based Kitaev material Na2Co2TeO6 is a promising candidate whose magnetic phase diagram of B // a* contains a field-induced intermediate magnetically disordered phase within 7.5 T < |B| < 10 T. The experimental observations, including the restoration of the crystalline point group symmetry in the angle-dependent torque and the coexisting magnon excitations and spinon-continuum in the inelastic neutron scattering spectrum, provide strong evidence that this disordered phase is a field induced quantum spin liquid with partially polarized spins. Our variational Monte Carlo simulation with the effective K-J1-{\Gamma}-{\Gamma}'-J3 model reproduces the experimental data and further supports this conclusion.
ISSN:2331-8422