Effect of Pressure on Tiny Antiferromagnetic Moment in the Heavy-Electron Compound URu_2Si_2

H. Amitsuka; M. Sato; N. Metoki; M. Yokoyama; K. Kuwahara; T. Sakakibara; H. Morimoto; S. Kawarazaki; Y. Miyako; J. A. Mydosh

doi:10.1103/PhysRevLett.83.5114

paper

Effect of Pressure on Tiny Antiferromagnetic Moment in the Heavy-Electron Compound URu_2Si_2

arXiv:cond-mat/9910509 · doi:10.1103/PhysRevLett.83.5114

Abstract

We have performed elastic neutron-scattering experiments on the heavy-electron compound URu_2Si_2 for pressure P up to 2.8 GPa. We have found that the antiferrmagnetic (100) Bragg reflection below T_m ~ 17.5 K is strongly enhanced by applying pressure. For P < 1.1 GPa, the staggered moment mu_o at 1.4 K increases linearly from ~ 0.017(3) mu_B to ~ 0.25(2) mu_B, while T_m increases slightly at a rate ~ 1 K/GPa, roughly following the transition temperature T_o determined from macroscopic anomalies. We have also observed a sharp phase transition at P_c ~ 1.5 GPa, above which a 3D-Ising type of antiferromagnetic phase (mu_o ~ 0.4 mu_B) appears with a slightly reduced lattice constant.

RevTeX, 4 pages, 4 eps figures, accepted for publication in Phys. Rev. Lett

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