Optical study of the electronic phase transition of strongly correlated YbInCu{sub 4}

Journal Article · Tue Aug 15 04:00:00 EDT 2000 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.62.R4778· OSTI ID:20217468

Garner, Sean R ^[1]; Hancock, Jason N ^[1]; Rodriguez, Yvonne W ^[1]; Schlesinger, Zack ^[1]; Bucher, Benno ^[2]; Fisk, Zach ^[3]; Sarrao, John L ^[4]

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1. Department of Physics, University of California, Santa Cruz, California 95064 (United States)
2. Department of Physics, ITR, Oberseestrasse 10, 8640 Rapperswil, (Switzerland)
3. Department of Physics and NHMFL, Florida State University, Talahassee, Florida 32310 (United States)
4. Los Alamos National Laboratory, Los Alamos, New Mexico 84545 (United States)

Infrared, visible, and near-UV reflectivity measurements are used to obtain conductivity as a function of temperature and frequency in YbInCu{sub 4}, which exhibits an isostructural phase-transition into a mixed-valent phase below T{sub v}{approx_equal}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. (c) 2000 The American Physical Society.

• OSTI ID: 20217468
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 8 Vol. 62; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER ALLOYS
ELECTRIC CONDUCTIVITY
EXPERIMENTAL DATA
INDIUM ALLOYS
KONDO EFFECT
OPTICAL PROPERTIES
PHASE TRANSFORMATIONS
YTTERBIUM ALLOYS