Superconductivity emerging near quantum critical point of valence transition

Shinji Watanabe*, Masatoshi Imada, Kazumasa Miyake

*この研究の対応する著者

研究成果: Article査読

75 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号043710
ジャーナルjournal of the physical society of japan
75
4
DOI
出版ステータスPublished - 2006 4月
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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