Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-02-13
J. Phys. Soc. Jpn. 75 (2006) 043710
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 4 figures
Scientific paper
10.1143/JPSJ.75.043710
The nature of the quantum valence transition is studied in the one-dimensional periodic Anderson model with Coulomb repulsion between f and conduction electrons by the density-matrix renormalization group method. It is found that the first-order valence transition emerges with the quantum critical point and the crossover from the Kondo to the mixed-valence states is strongly stabilized by quantum fluctuation and electron correlation. It is found that the superconducting correlation is developed in the Kondo regime near the sharp valence increase. The origin of the superconductivity is ascribed to the development of the coherent motion of electrons with enhanced valence fluctuation, which results in the enhancement of the charge velocity, but not of the charge compressibility. Statements on the valence transition in connection with Ce metal and Ce compounds are given.
Imada Masatoshi
Miyake Kazumasa
Watanabe Shinji
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