High-Magnetic-Field Lattice Length Changes in URu2Si2

作者：Correa V F^*; Francoual S; Jaime M; Harrison N; Murphy T P; Palm E C; Tozer S W; Lacerda A H; Sharma P A; Mydosh J A

来源：Physical Review Letters, 2012, 109(24): 246405.

DOI：10.1103/PhysRevLett.109.246405

We report high-magnetic-field (up to 45 T) (c) over cap -axis thermal-expansion and magnetostriction experiments on URu2Si2 single crystals. The sample length change Delta L-c(T-HO)/L-c associated with the transition to the %26quot;hidden order%26apos;%26apos; phase becomes increasingly discontinuous as the magnetic field is raised above 25 T. The reentrant ordered phase III is clearly observed in both the thermal expansion Delta L-c(T)/L-c and magnetostriction Delta L-c(B)/L-c above 36 T, in good agreement with previous results. The sample length is also discontinuous at the boundaries of this phase, mainly at the upper boundary. A change in the sign of the coefficient of thermal expansion alpha(c) = 1/L-c (partial derivative Delta L-c/partial derivative T) is observed at the metamagnetic transition (B-M similar to 38 T), which is likely related to the existence of a quantum critical end point. DOI: 10.1103/PhysRevLett.109.246405

• 出版日期2012-12-11