Field Reentrance of the Hidden Order State of URu2Si2 under Pressure
Dai Aoki, Frederic Bourdarot, Elena Hassinger, Georg Knebel, Atsushi, Miyake, Stephane Raymond, Valentin Taufour, Jacques Flouquet
TL;DR
This study investigates the reentrance of the hidden order phase in URu2Si2 under pressure and magnetic field, revealing a correlation between magnetic resonance and phase transitions through neutron scattering and thermal expansion measurements.
Contribution
It provides the first combined microscopic and macroscopic evidence of the hidden order reentrance in URu2Si2 under pressure and magnetic field.
Findings
Hidden order reenters when antiferromagnetism collapses.
Resonance at Q_0 reappears under magnetic field.
HO-AF boundary shifts with 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.
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