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Optical study of the electronic phase transition of strongly correlated YbInCu_4

Sean R. Garner·Jason N. Hancock·Yvonne W. Rodriguez·Zack Schlesinger·Benno Bucher·Zach Fisk·John L. Sarrao
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Abstract

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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Sean R. Garner, Jason N. Hancock, Yvonne W. Rodriguez, Zack Schlesinger, Benno Bucher, Zach Fisk, John L. Sarrao. 2000-07-10. Optical study of the electronic phase transition of strongly correlated YbInCu_4. https://doi.org/10.1103/physrevb.62.r4778

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