Effect of Pressure on Tiny Antiferromagnetic Moment in the Heavy-Electron Compound URu2Si2
Abstract
We have performed elastic neutron-scattering experiments on the heavy-electron compound URu2Si2 for pressure P up to 2.8 GPa. We have found that the antiferrmagnetic (100) Bragg reflection below Tm ~ 17.5 K is strongly enhanced by applying pressure. For P < 1.1 GPa, the staggered moment muo at 1.4 K increases linearly from ~ 0.017(3) muB to ~ 0.25(2) muB, while Tm increases slightly at a rate ~ 1 K/GPa, roughly following the transition temperature To determined from macroscopic anomalies. We have also observed a sharp phase transition at Pc ~ 1.5 GPa, above which a 3D-Ising type of antiferromagnetic phase (muo ~ 0.4 muB) appears with a slightly reduced lattice constant.
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