Antiferromagnetic critical pressure in URu2Si2 under hydrostatic conditions

Details Antiferromagnetic critical pressure in URu2Si2 under hydrostatic conditions Antiferromagnetic critical pressure in URu2Si2 under hydrostatic conditions

2010-06-21

arxiv.org/abs/1006.4140v2

Phys. Rev. B 82, 060408(R) (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevB.82.060408

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.

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