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Pressure-induced magnetism and hidden order in URu2Si2

Authors
Journal
Physica B Condensed Matter
0921-4526
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/s0921-4526(01)01502-2
Keywords
  • Uru2Si2
  • Hidden Order
  • Antiferromagnetism
Disciplines
  • Physics

Abstract

Abstract We discuss the discovery of pressure-induced antiferromagnetism in URu 2Si 2, in the context of neutron, NMR and μSR results. The identification of a critical pressure separating mean-field and Ising phase transitions leads us to propose that the system lies close to a bicritical point associated with magnetic and (non-magnetic) hidden order. We note that the recent observation of an isotropic, field-independent component in the silicon NMR line-width implies that the hidden order parameter breaks time-reversal invariance. Relying on simple estimates for the observed local fields, we conclude that URu 2Si 2 is a strong candidate for an incommensurate orbital antiferromagnet.

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