Singular field response and singular screening of vacancies in antiferromagnets

Abstract

For isolated vacancies in ordered local-moment antiferromagnets we show that the magnetic-field linear-response limit is generically singular: The magnetic moment associated with a vacancy in zero field is different from that in a finite field h in the limit h->0. The origin is a universal and singular screening cloud, which moreover leads to perfect screening as h->0 for magnets which display spin-flop bulk states in the weak-field limit.

arXiv comment5 pages, 4 figs, (v2) 2-page supplement added, final version as published

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• Robust semiclassical magnetization plateau in the kagome lattice