Antiferromagnetic critical pressure in URu2Si2 under hydrostatic conditions

Abstract

The onset of antiferromagnetic order in URu2Si2 has been studied via neutron diffraction in a helium pressure medium, which most closely approximates hydrostatic conditions. The antiferromagnetic critical pressure is 0.80 GPa, considerably higher than values previously reported. Complementary electrical resistivity measurements imply that the hidden order-antiferromagnetic bicritical point far exceeds 1.02 GPa. Moreover, the redefined pressure-temperature phase diagram suggests that the superconducting and antiferromagnetic phase boundaries actually meet at a common critical pressure at zero temperature.

5 pgs, 4 figs; AFM ordered moment revised to 0.5 muB, added and corrected citations and references

References in corpus (9)

• Gapped itinerant spin excitations account for missing entropy in the hidden order state of URu${}_2$Si${}_2$
• Lattice collapse and quenching of magnetism in CaFe2As2 under pressure: A single crystal neutron and x-ray diffraction investigation
• Evolution of critical scaling behavior near a ferromagnetic quantum phase transition
• 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
• The degree of 5f electron localization in URu2Si2: electron energy-loss spectroscopy and spin-orbit sum rule analysis
• Electrical Resistivity and Thermal Expansion Measurements of URu2Si2 under Pressure
• The suppression of hidden order and onset of ferromagnetism in URu2Si2 via Re substitution
• Hydrostaticity and hidden order: effects of experimental conditions on the temperature-pressure phase diagram of URu2Si2