Field Reentrance of the Hidden Order State of URu<SUB>2</SUB>Si<SUB>2</SUB> under Pressure

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  • Field reentrance of the hidden order state of URu2Si2 under pressure

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Combination of neutron scattering and thermal expansion measurements under pressure shows that the so-called hidden order phase of URu2Si2 reenters in magnetic field when antiferromagnetism (AF) collapses at HAF(T). Macroscopic pressure studies of the HO–AF boundaries were realized at different pressures via thermal expansion measurements under magnetic field using a strain gauge. Microscopic proof at a given pressure is the reappearance of the resonance at Q0=(1,0,0) under field which is correlated with the collapse of the AF Bragg reflections at Q0.

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