Thermal expansion under uniaxial pressure in URu2Si2

S. Kambe, Dai Aoki, B. Salce, F. Bourdarot, D. Braithwaite, J. Flouquet, J. P. Brison

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The temperature dependence of the thermal expansion coefficient α has been measured in URu2Si2 under uniaxial pressure σ along the [100] and [110] directions up to ∼0.6 GPa. For both cases, the hidden-order phase transition temperature T0 increases with increasing uniaxial pressure. An anomaly Δα of the thermal expansion coefficient at T0 appears to be enhanced under a small uniaxial pressure (<0.03 GPa). An antiferromagnetically ordered phase appears at TX above the critical pressure σX∼0.25 GPa for uniaxial pressure along the [100] direction, whereas no antiferromagnetic transition is detected up to ∼0.6 GPa for uniaxial pressure along the [110] direction, indicating that the critical pressure is beyond ∼0.6 GPa for the [110] case. In the previously reported hydrostatic case, an antiferromagnetic phase transition appears above the critical pressure PX∼0.5 GPa. The difference in critical pressure between σX and P X can be understood in terms of the pressure dependence of the U-U distance in the basal (001) plane.

Original languageEnglish
Article number115123
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number11
DOIs
Publication statusPublished - 2013 Mar 18

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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