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Three-dimensional Modulated Spin Liquid model applied to URu₂Si₂

Sébastian Burdin (Universidade de Bordéus - França)

We have developed a 3D version for the Modulated Spin Liquid [1] in a body-centered tetragonal lattice structure [2] to describe the hidden order observed in URu2Si2 at T=17.5 K.  This provides a simple scenario where the hidden order results from a quantum phase transition with a very unusual behavior: the magnetic moments of the AF phase melt at low pressure, restoring the time reversal symmetry, but the lattice symmetry breaking is still present. The symmetry of the modulation is minimized for Q=(1,1,1). We assume a linear variation of the interaction parameters with the lattice spacing and our results show good agreement with uniaxial and pressure experiments.

[1] C. Pépin, M.R. Norman, S. Burdin, A. Ferraz, Phys. Rev. Lett. 106, 106601 (2011).
[2] C. Thomas, S. Burdin, C. Pépin, A. Ferraz, arXiv:1206.5778.