Hydrostaticity and hidden order: effects of experimental conditions on the temperature-pressure phase diagram of URu2Si2

Abstract

The pressure-dependence of the hidden order phase transition of URu2Si2 is shown to depend sensitively upon the quality of hydrostatic pressure conditions during electrical resistivity measurements. Hysteresis in pressure is demonstrated for two choices of pressure medium: the commonly-used mixture of 1:1 Fluorinert FC70/FC77 and pure FC75. In contrast, no hysteresis is observed when the pressure medium is a 1:1 mixture of n-pentane/isoamyl alcohol, as it remains hydrostatic over the entire studied pressure range. Possible ramifications for the interpretation of the temperature-pressure phase diagram of URu2Si2 are discussed.

9 pgs, 2 figs, accepted by High Pressure Research

References in corpus (5)

• Exotic Superconducting Properties in the Electron-Hole Compensated Heavy Fermion `Semimetal' URu2Si2
• Interplay between SDW and induced local moments in URu2Si2
• Competition between hidden order and antiferromagnetism in URu_2Si_2 under uniaxial stress studied by neutron scattering
• Competing Ordered Phases in URu2Si2: Hydrostatic Pressure and Re-substitution
• Pressure dependence of the magnetization of URu2Si2