Phase diagram and thermal expansion measurements on the system URu2−xFexSi2
Department or Administrative Unit
The identity of the order parameter of the hidden-order (HO) phase in the heavy fermion compound URu2Si2 remains a long-standing mystery. The HO phase is intimately related to the large-moment antiferromagnetic (LMAFM) phase that is induced under pressure. Although these two phases presumably have distinct order parameters, their transport and thermodynamic properties are nearly indistinguishable. The measurements reported herein reveal that the HO and LMAFM phase transitions are manifested differently in the uniaxial thermal expansion coefficients and uniaxial pressure derivatives of the transition temperature. These results suggest that an itinerant effective model should include band states of different orbital and magnetic characters, if it is to describe the differing responses of the competing ordered phases to uniaxial pressure.
Ran, S., Wolowiec, C. T., Jeon, I., Pouse, N., Kanchanavatee, N., White, B. D., Huang, K., Martien, D., DaPron, T., Snow, D., Williamsen, M., Spagna, S., Riseborough, P. S., & Maple, M. B. (2016). Phase diagram and thermal expansion measurements on the system URu2−xFexSi2. Proceedings of the National Academy of Sciences, 113(47), 13348–13353. https://doi.org/10.1073/pnas.1616542113
Proceedings of the National Academy of Sciences
Copyright © The Authors 2016