Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-09-11
Phys. Rev. Lett. 104 (2010) 106406
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures
Scientific paper
We report simultaneous measurements of the distribution of lattice constants and the antiferromagnetic moment in high-purity URu2Si2, using both Larmor and conventional neutron diffraction, as a function of temperature and pressure up to 18 kbar. We establish that the tiny moment in the hidden order (HO) state is purely parasitic and quantitatively originates from the distribution of lattice constants. Moreover, the HO and large-moment antiferromagnetism (LMAF) at high pressure are separated by a line of first-order phase transitions, which ends in a bicritical point. Thus the HO and LMAF are coupled non-linearly and must have different symmetry, as expected of the HO being, e.g., incommensurate orbital currents, helicity order, or multipolar order.
Huang Yue-Kai
Keller Thomas
Mydosh John A.
Niklowitz P. G.
Pfleiderer Ch.
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