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  • Title: Phase transition between hidden and antiferromagnetic order in URu2Si2.
    Author: Motoyama G, Nishioka T, Sato NK.
    Journal: Phys Rev Lett; 2003 Apr 25; 90(16):166402. PubMed ID: 12731985.
    Abstract:
    We have carried out thermal expansion measurements on the heavy fermion compound URu2Si2. We have discovered a new anomaly that appears only under pressure for both the tetragonal a and c axes. Plotting these temperatures on a temperature-pressure plane, we have constructed a phase diagram, in which there is a first order phase transition boundary separating a hidden and antiferromagnetic order. When the system enters the antiferromagnetic phase from the hidden order, the lattice constant shrinks along the a axis and elongates along the c axis, leading to an increase in the lattice constant ratio of c/a. We conclude that the system lies close to a bicritical point from which the first order phase transition line emanates.
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