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. \v{C}erm\'ak, A. Schneidewind, S. Yano, J. S. Gardner, Xin Lu, Shun-Li Yu,, Jun-Ming Liu, Shiyan Li, Jian-Xin Li
TL;DR
This paper identifies the ground state of YbZnGaO$_4$ as a spin glass through comprehensive experimental evidence, highlighting the role of disorder and frustration in its magnetic behavior.
Contribution
The study provides the first definitive identification of a spin-glass ground state in YbZnGaO$_4$, supported by ultralow-temperature susceptibility measurements and comparisons with related compounds.
Findings
No long-range magnetic order observed
Frequency-dependent peaks indicating spin freezing
Disorder and frustration drive the spin-glass phase
Abstract
We report on comprehensive results identifying the ground state of a triangular-lattice structured YbZnGaO 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, 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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