Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-07-22
Physics
Condensed Matter
Strongly Correlated Electrons
17 pages including figures, updated author institutions and acknowledgements
Scientific paper
10.1103/PhysRevLett.97.156401
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.
Amitsuka Hiroshi
Batista Cristian D.
Harrison Neil
Jaime Marcelo
Kim Kyung Hyuk
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