Journal article

Cluster-Glass Phase in Pyrochlore XY Antiferromagnets with Quenched Disorder

Eric C Andrade, Jose A Hoyos, Stephan Rachel, Matthias Vojta

PHYSICAL REVIEW LETTERS | AMER PHYSICAL SOC | Published : 2018

Abstract

We study the impact of quenched disorder (random exchange couplings or site dilution) on easy-plane pyrochlore antiferromagnets. In the clean system, order by disorder selects a magnetically ordered state from a classically degenerate manifold. In the presence of randomness, however, different orders can be chosen locally depending on details of the disorder configuration. Using a combination of analytical considerations and classical Monte Carlo simulations, we argue that any long-range-ordered magnetic state is destroyed beyond a critical level of randomness where the system breaks into magnetic domains due to random exchange anisotropies, becoming, therefore, a glass of spin clusters, in ..

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University of Melbourne Researchers

Grants

Awarded by FAPESP (Brazil)


Awarded by CNPq (Brazil)


Awarded by CNPq


Awarded by FAPESP


Awarded by DFG


Funding Acknowledgements

We acknowledge instructive discussions with B. Gaulin, H.-H. Klauss, K. Ross, R. Sarkar, and M. Zhitomirsky. E. C. A. was supported by FAPESP (Brazil) Grant No. 2013/00681-8 and CNPq (Brazil) Grant No. 302065/2016-4. J. A. H. was supported by CNPq Grant No. 307548/2015-5 and FAPESP Grants No. 2015/23849-7 and No. 2016/10826-1. S. R. and M. V. were supported by DFG SFB 1143.