Spin-Glass Ground State in a Triangular-Lattice Compound YbZnGaO_{4}

We report on comprehensive results identifying the ground state of a triangular-lattice structured YbZnGaO_{4} as a spin glass, including no long-range magnetic order, prominent broad excitation continua, and the absence of magnetic thermal conductivity. More crucially, from the ultralow-temperature...

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Bibliographic Details
Published in:Physical review letters 2018-02, Vol.120 (8), p.087201-087201
Main Authors: Ma, Zhen, Wang, Jinghui, Dong, Zhao-Yang, Zhang, Jun, Li, Shichao, Zheng, Shu-Han, Yu, Yunjie, Wang, Wei, Che, Liqiang, Ran, Kejing, Bao, Song, Cai, Zhengwei, Čermák, P, Schneidewind, A, Yano, S, Gardner, J S, Lu, Xin, Yu, Shun-Li, Liu, Jun-Ming, Li, Shiyan, Li, Jian-Xin, Wen, Jinsheng
Format: Article
Language:English
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Summary:We report on comprehensive results identifying the ground state of a triangular-lattice structured YbZnGaO_{4} as a spin glass, including no long-range magnetic order, prominent broad excitation continua, and the absence of magnetic thermal conductivity. More crucially, from the ultralow-temperature ac susceptibility measurements, we unambiguously observe frequency-dependent peaks around 0.1 K, indicating the spin-glass ground state. We suggest this conclusion holds also for its sister compound YbMgGaO_{4}, which is confirmed by the observation of spin freezing at low temperatures. We consider disorder and frustration to be the main driving force for the spin-glass phase.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.120.087201