Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-10-06
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 7 figures, submitted to J. Phys. Soc. Jpn
Scientific paper
10.1143/JPSJ.68.159
The ground state properties of the one-dimensional Kondo lattice with an f^2 configuration at each site are studied by the density matrix renormalization group method. At half-filling, competition between the Kondo exchange J and the antiferromagnetic intra f-shell exchange I leads to reduction of energy gaps for spin, quasi-particle and charge excitations. The attractive force among conduction electrons is induced by the competition and the bound state is formed. As J/I increases the f^2 singlet gives way to the Kondo singlet as the dominant local correlation. The remarkable change of the quasi-particle gap is driven by the change of the spin-1/2 excitation character from the itinerant one to the localized one. Possible metal-insulator transition is discussed which may occur as the ratio J/I is varied by reference to mean-field results in the f^2 lattice system and the two impurity Kondo system.
Kuramoto Yoshio
Nishino Tomotoshi
Shibata Naokazu
Watanabe Shin
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