Optical study of the electronic phase transition of strongly correlated YbInCu_4

Details Optical study of the electronic phase transition of strongly correlated YbInCu_4 Optical study of the electronic phase transition of strongly correlated YbInCu_4

2000-07-10

arxiv.org/abs/cond-mat/0007165v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures (to appear in Phys. Rev. B)

Scientific paper

10.1103/PhysRevB.62.R4778

Infrared, visible and near-UV reflectivity measurements are used to obtain conductivity as a function of temperature and frequency in YbInCu_4, which exhibits an isostructural phase-transition into a mixed-valent phase below T_v=42 K. In addition to a gradual loss of spectral weight with decreasing temperature extending up to 1.5 eV, a sharp resonance appears at 0.25 eV in the mixed-valent phase. This feature can be described in terms of excitations into the Kondo (Abrikosov-Suhl) resonance, and, like the sudden reduction of resistivity, provides a direct reflection of the onset of coherence in this strongly correlated electron system.

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