Hybridization gap and anisotropic far-infrared optical conductivity of URu2Si2
Abstract
We performed far-infrared optical spectroscopy measurements on the heavy fermion compound URu2Si2 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 entropy nor on the DC transport properties, we suggest that this is a crossover phenomenon rather than a thermodynamic phase transition.
- Publication:
-
Physical Review B
- Pub Date:
- November 2011
- DOI:
- 10.1103/PhysRevB.84.184420
- arXiv:
- arXiv:1007.0538
- Bibcode:
- 2011PhRvB..84r4420L
- Keywords:
-
- 75.30.Mb;
- 71.27.+a;
- 78.30.Er;
- 71.45.-d;
- Valence fluctuation Kondo lattice and heavy-fermion phenomena;
- Strongly correlated electron systems;
- heavy fermions;
- Solid metals and alloys;
- Collective effects;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- To be published in Physical Review B