Phonon Thermal Transport of URu2Si2: Broken Translational Symmetry and Strong-Coupling of the Hidden Order to the Lattice

Abstract

A dramatic increase in the total thermal conductivity (k) is observed in the Hidden Order (HO) state of single crystal URu2Si2. Through measurements of the thermal Hall conductivity, we explicitly show that the electronic contribution to k is extremely small, so that this large increase in k is dominated by phonon conduction. An itinerant BCS/mean-field model describes this behavior well: the increase in kappa is associated with the opening of a large energy gap at the Fermi Surface, thereby decreasing electron-phonon scattering. Our analysis implies that the Hidden Order parameter is strongly coupled to the lattice, suggestive of a broken symmetry involving charge degrees of freedom.

arXiv comment17 pages including figures, updated author institutions and acknowledgements

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• Interplay between Fermi surface topology and ordering in URu${}_2$Si${}_2$ revealed through abrupt Hall coefficient changes in strong magnetic fields
• Antiferromagnetic critical pressure in URu2Si2 under hydrostatic conditions
• Competing Ordered Phases in URu2Si2: Hydrostatic Pressure and Re-substitution
• Symmetry and correlations underlying Hidden Order in URu2Si2
• On the destruction of the hidden order in URu${}_2$Si${}_2$ by a strong magnetic field
• The suppression of hidden order and onset of ferromagnetism in URu2Si2 via Re substitution
• Skutterudite Results Shed Light on Heavy Fermion Physics
• Hydrostaticity and hidden order: effects of experimental conditions on the temperature-pressure phase diagram of URu2Si2
• Inelastic x-ray scattering measurements on URu2Si2
• Magneto-transport properties of CeRu${}_2$Al${}_{10}$: Similarities to URu${}_2$Si${}_2$