TY - JOUR
T1 - Thermal expansion under uniaxial pressure in URu2Si2
AU - Kambe, S.
AU - Aoki, D.
AU - Salce, B.
AU - Bourdarot, F.
AU - Braithwaite, D.
AU - Flouquet, J.
AU - Brison, J. P.
PY - 2013/3/18
Y1 - 2013/3/18
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.87.115123
DO - 10.1103/PhysRevB.87.115123
M3 - Article
AN - SCOPUS:84875295085
VL - 87
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 11
M1 - 115123
ER -