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000904963 1001_ $$0P:(DE-HGF)0$$aMa, Zhen$$b0$$eCorresponding author
000904963 245__ $$aDisorder-induced broadening of the spin waves in the triangular-lattice quantum spin liquid candidate YbZnGaO$_4$
000904963 260__ $$aWoodbury, NY$$bInst.$$c2021
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000904963 520__ $$aDisorder is important in the study of quantum spin liquids, but its role on the spin dynamics remains elusive. Here, we explore the disorder effect by investigating the magnetic-field dependence of the low-energy magnetic excitations in a triangular-lattice frustrated magnet YbZnGaO4 with inelastic neutron scattering. With an intermediate field of 2.5 T applied along the c axis, the broad continuum at zero field becomes more smeared both in energy and momentum. With a field up to 10 T, which fully polarizes the magnetic moments, we observe clear spin-wave excitations with a gap of ∼1.4meV comparable to the bandwidth. However, the spectra are significantly broadened. The excitation spectra both at zero and high fields can be reproduced by performing classical Monte Carlo simulations which take into account the disorder effect arising from the random site mixing of nonmagnetic Zn2+ and Ga3+ ions. These results elucidate the critical role of disorder in broadening the magnetic excitation spectra and mimicking the spin-liquid features in frustrated quantum magnets.
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000904963 65027 $$0V:(DE-MLZ)SciArea-170$$2V:(DE-HGF)$$aMagnetism$$x0
000904963 65017 $$0V:(DE-MLZ)GC-1604-2016$$2V:(DE-HGF)$$aMagnetic Materials$$x0
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000904963 7001_ $$0P:(DE-HGF)0$$aDong, Zhao-Yang$$b1
000904963 7001_ $$0P:(DE-HGF)0$$aWang, Jinghui$$b2
000904963 7001_ $$0P:(DE-HGF)0$$aZheng, Shuhan$$b3
000904963 7001_ $$0P:(DE-HGF)0$$aRan, Kejing$$b4
000904963 7001_ $$0P:(DE-HGF)0$$aBao, Song$$b5
000904963 7001_ $$0P:(DE-HGF)0$$aCai, Zhengwei$$b6
000904963 7001_ $$0P:(DE-HGF)0$$aShangguan, Yanyan$$b7
000904963 7001_ $$0P:(DE-HGF)0$$aWang, Wei$$b8
000904963 7001_ $$0P:(DE-HGF)0$$aBoehm, M.$$b9
000904963 7001_ $$0P:(DE-HGF)0$$aSteffens, P.$$b10
000904963 7001_ $$0P:(DE-HGF)0$$aRegnault, L.-P.$$b11
000904963 7001_ $$0P:(DE-Juel1)171236$$aWang, Xiao$$b12
000904963 7001_ $$0P:(DE-Juel1)130991$$aSu, Yixi$$b13
000904963 7001_ $$0P:(DE-HGF)0$$aYu, Shun-Li$$b14$$eCorresponding author
000904963 7001_ $$0P:(DE-HGF)0$$aLiu, Jun-Ming$$b15
000904963 7001_ $$0P:(DE-HGF)0$$aLi, Jian-Xin$$b16$$eCorresponding author
000904963 7001_ $$0P:(DE-HGF)0$$aWen, Jinsheng$$b17$$eCorresponding author
000904963 773__ $$0PERI:(DE-600)2844160-6$$a10.1103/PhysRevB.104.224433$$gVol. 104, no. 22, p. 224433$$n22$$p224433$$tPhysical review / B$$v104$$x1098-0121$$y2021
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