Nonequilibrium Antiferromagnetic State in the Heavy Electron Compound URu_2Si_2

Details Nonequilibrium Antiferromagnetic State in the Heavy Electron Compound URu_2Si_2 Nonequilibrium Antiferromagnetic State in the Heavy Electron Compound URu_2Si_2

2002-07-24

arxiv.org/abs/cond-mat/0207589v1

Acta Phys. Pol. B 34, 1067 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 eps figures, To appear in proceedings of SCES 2002 (Krakow)

Scientific paper

We have investigated the nature of the antiferromagnetic (AF) phase induced by uniaxial stress sigma in URu2Si2, by performing elastic neutron scattering measurements up to 0.4 GPa. We have found that the AF Bragg-peak intensity shows a clear hysteresis loop with sigma under the zero-stress cooling condition. The result strongly suggests that the sigma-induced AF phase is metastable and separated from the coexisting "hidden ordered" phase by a first-order phase transition. We also present the analyses of the crystalline strain effects, and suggest that the c/a ratio plays an important role in the competition between these two phases.

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