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

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.

arXiv commentVersion as accepted to PRL

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