Evolution of the Kondo lattice electronic structure above the transport coherence temperature
SCIE
SCOPUS
- Title
- Evolution of the Kondo lattice electronic structure above the transport coherence temperature
- Authors
- Jang, S.; Denlinger, J.D.; Allen, J.W.; Zapf, V.S.; Maple, M.B.; Kim, J.N.; Jang, B.G.; Shim, J.H.
- Date Issued
- 2020-09
- Publisher
- NATL ACAD SCIENCES
- Abstract
- The temperature-dependent evolution of the Kondo lattice is a long-standing topic of theoretical and experimental investigation and yet it lacks a truly microscopic description of the relation of the basic f-c hybridization processes to the fundamental temperature scales of Kondo screening and Fermi-liquid lattice coherence. Here, the temperature dependence of f-c hybridized band dispersions and Fermi-energy f spectral weight in the Kondo lattice system CeCoIn5 is investigated using f-resonant angle-resolved photoemission spectroscopy (ARPES) with sufficient detail to allow direct comparison to first-principles dynamical mean-field theory (DMFT) calculations containing full realism of crystalline electric-field states. The ARPES results, for two orthogonal (001) and (100) cleaved surfaces and three different f-c hybridization configurations, with additional microscopic insight provided by DMFT, reveal f participation in the Fermi surface at temperatures much higher than the lattice coherence temperature, T* approximate to 45 K, commonly believed to be the onset for such behavior. The DMFT results show the role of crystalline electric-field (CEF) splittings in this behavior and a T-dependent CEF degeneracy crossover below T* is specifically highlighted. A recent ARPES report of low T Luttinger theorem failure for CeCoIn5 is shown to be unjustified by current ARPES data and is not found in the theory.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/105561
- DOI
- 10.1073/pnas.2001778117
- ISSN
- 0027-8424
- Article Type
- Article
- Citation
- PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, vol. 117, no. 38, page. 23467 - 23476, 2020-09
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