Mass Enhancement in an Intermediate-Valent Regime of Heavy-Fermion Systems

Details Mass Enhancement in an Intermediate-Valent Regime of Heavy-Fermion Systems Mass Enhancement in an Intermediate-Valent Regime of Heavy-Fermion Systems

2011-06-13

arxiv.org/abs/1106.2360v1

J. Phys. Soc. Jpn. 80, 063706 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1143/JPSJ.80.063706

We study the mechanism of the mass enhancement in an intermediate-valent regime of heavy-fermion materials. We find that the crossovers between the Kondo, intermediate valent, and almost empty f-electron regimes become sharp with the Coulomb interaction between the conduction and f electrons. In the intermediate-valent regime, we find a substantial mass enhancement, which is not expected in previous theories. Our theory may be relevant to the observed nonmonotonic variation in the effective mass under pressure in CeCu2Si2 and the mass enhancement in the intermediate-valent compounds alpha-YbAlB4 and beta-YbAlB4.

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