Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-02-16
Phys. Rev. B 83, 165110 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 1 figure ; to appear in Phys. Rev. B
Scientific paper
We discuss the conclusions on the symmetry of hidden order (HO) in URu2Si2 that may be drawn from recent torque experiments in rotating magnetic field by Okazaki et al. [1]. They are very sensitive to changes in the magnetic susceptibility induced by HO. We show that the observed twofold angular torque oscillations give evidence that hidden order has degenerate E- type (yz,zx) symmetry where both components are realised. The oscillations have the wrong characteristics or are absent for the 1D nontrivial representations like quadrupolar B1 (x^2-y^2) and B2 (xy) type HO or hexadecapolar A2(xy(x^2-y^2)) type HO. Therefore they may be excluded as candidates for hidden order. We also predict the field-angular variation of possible field-induced Bragg peaks based on underlying E-type order parameter and discuss the expected elastic constant anomalies.
Takimoto Tetsuya
Thalmeier Peter
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