Effects of Uniaxial Stress on Antiferromagnetic Moment in the Heavy Electron Compound URu2Si2
Abstract
We have performed the elastic neutron scattering experiments under uniaxial stress σ along the tetragonal [100], [110] and [001] directions for URu2Si2. For σ // [100] and [110], the antiferromagnetic moment μo is strongly enhanced from 0.02 μB (σ=0) to 0.22 μB (σ=2.5 kbar) at 1.5 K. The rate of increase dμo/dσ is roughly estimated to be ~ 0.1 μB/kbar, which is much larger than that for the hydrostatic pressure (~ 0.025 μB/kbar). Above 2.5 kbar, μo shows a tendency to saturate similar to the behavior in the hydrostatic pressure. For σ // [001], on the other hand, μo shows only a slight increase to 0.028 μB (σ = 4.6 kbar) with a rate of ~ 0.002 μB/kbar. The observed anisotropy suggests that the competition between the hidden order and the antiferromagnetic state in URu2Si2 is strongly coupled with the tetragonal four-fold symmetry and the c/a ratio, or both.
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