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Effects of Uniaxial Stress on Antiferromagnetic Moment in the Heavy Electron Compound URu_2Si_2

M. Yokoyama·H. Amitsuka·K. Watanabe·S. Kawarazaki·H. Yoshizawa·J. A. Mydosh
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Abstract

We have performed the elastic neutron scattering experiments under uniaxial stress σalong the tetragonal [100], [110] and [001] directions for URu2Si2. For σ// [100] and [110], the antiferromagnetic moment μ_o is strongly enhanced from 0.02 μ_B (σ=0) to 0.22 μ_B (σ=2.5 kbar) at 1.5 K. The rate of increase dμ_o/dσis roughly estimated to be ~ 0.1 μ_B/kbar, which is much larger than that for the hydrostatic pressure (~ 0.025 μ_B/kbar). Above 2.5 kbar, μ_o shows a tendency to saturate similar to the behavior in the hydrostatic pressure. For σ// [001], on the other hand, μ_o shows only a slight increase to 0.028 μ_B (σ= 4.6 kbar) with a rate of ~ 0.002 μ_B/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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M. Yokoyama, H. Amitsuka, K. Watanabe, S. Kawarazaki, H. Yoshizawa, J. A. Mydosh. 2002-06-06. Effects of Uniaxial Stress on Antiferromagnetic Moment in the Heavy Electron Compound URu_2Si_2. https://doi.org/10.1143/jpsjs.71s.264

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