Field Reentrance of the Hidden Order State of URu2Si2 under Pressure

Abstract

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 H_AF (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 Q_0=(1,0,0) under field which is correlated with the collapse of the AF Bragg reflections at Q_0.

5 pages, 6 figures, accepted for publication in J. Phys. Soc. Jpn

References in corpus (2)

• Gapped itinerant spin excitations account for missing entropy in the hidden order state of URu${}_2$Si${}_2$
• On the destruction of the hidden order in URu${}_2$Si${}_2$ by a strong magnetic field

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