Hybridization gap and anisotropic far-infrared optical conductivity of URuSi

J Levallois, F Lévy-Bertrand, MK Tran, D Stricker… - Physical Review B …, 2011 - APS
Physical Review B—Condensed Matter and Materials Physics, 2011APS
We performed far-infrared optical spectroscopy measurements on the heavy fermion
compound URu 2 Si 2 as a function of temperature. The light's electric field was applied
along the a or c axis of the tetragonal structure. We show that in addition to a pronounced
anisotropy, the optical conductivity exhibits for both axis a partial suppression of spectral
weight around 12 meV and below 30 K. We attribute these observations to a change in the
band structure below 30 K. However, since these changes have no noticeable impact on the …
We performed far-infrared optical spectroscopy measurements on the heavy fermion compound URuSi as a function of temperature. The light's electric field was applied along the or axis of the tetragonal structure. We show that in addition to a pronounced anisotropy, the optical conductivity exhibits for both axis a partial suppression of spectral weight around 12 meV and below 30 K. We attribute these observations to a change in the band structure below 30 K. However, since these changes have no noticeable impact on the entropy nor on the DC transport properties, we suggest that this is a crossover phenomenon rather than a thermodynamic phase transition.
American Physical Society
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