Pressure-Induced Magnetism and Hidden Order in URu_2Si_2

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 conclude 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 and present a preliminary discussion of the underlying nature of the hidden order parameter.

arXiv commentTo appear in proceedings of SCES 2001

References in corpus (5)

• Hidden Order in the Cuprates
• Theory of Underdoped Cuprates
• Effect of Pressure on Tiny Antiferromagnetic Moment in the Heavy-Electron Compound URu_2Si_2
• Staggered-vorticity correlations in a lightly doped t-J model: a variational approach
• Hidden Order in $UR{u}_{2}S{i}_2$

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• The Case for Phase Separation in $UR{u}_{2}S{i}_2$
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