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arXiv · 1709.00256

Spin-glass ground state in a triangular-lattice compound YbZnGaO$_4$

Zhen Ma·Jinghui Wang·Zhao-Yang Dong·Jun Zhang·Shichao Li·Shu-Han Zheng·Yunjie Yu·Wei Wang·Liqiang Che·Kejing Ran·Song Bao·Zhengwei Cai·P. Čermák·A. Schneidewind·S. Yano·J. S. Gardner·Xin Lu·Shun-Li Yu·Jun-Ming Liu·Shiyan Li·Jian-Xin Li·Jinsheng Wen
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Abstract

We report on comprehensive results identifying the ground state of a triangular-lattice structured YbZnGaO$_4$ to be spin glass, including no long-range magnetic order, prominent broad excitation continua, and absence of magnetic thermal conductivity. More crucially, from the ultralow-temperature a.c. susceptibility measurements, we unambiguously observe frequency-dependent peaks around 0.1 K, indicating the spin-glass ground state. We suggest this conclusion to hold 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.

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Zhen Ma, Jinghui Wang, Zhao-Yang Dong, Jun Zhang, Shichao Li, Shu-Han Zheng, Yunjie Yu, Wei Wang, Liqiang Che, Kejing Ran, Song Bao, Zhengwei Cai, P. Čermák, A. Schneidewind, S. Yano, J. S. Gardner, Xin Lu, Shun-Li Yu, Jun-Ming Liu, Shiyan Li, Jian-Xin Li, Jinsheng Wen. 2017-09-01. Spin-glass ground state in a triangular-lattice compound YbZnGaO$_4$. https://doi.org/10.1103/physrevlett.120.087201

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