Abstract
The ground state properties of the one-dimensional Kondo lattice with an f2 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 the reduction of the characteristic energy scale. 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. The attractive force among conduction electrons is induced by the competition and a bound electron pair is formed. Off half-filling, the spin gap remains but the charge gap is closed. This constitutes a new mechanism of superconductivity in multi-orbital systems. For small J/I an effective model is derived by perturbation theory and is studied by bosonization and scaling theory.
Original language | English |
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Pages (from-to) | 260-261 |
Number of pages | 2 |
Journal | Physica B: Condensed Matter |
Volume | 281-282 |
DOIs | |
Publication status | Published - 2000 Jun 1 |
Event | Yamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99) - Nagano, Jpn Duration: 1999 Aug 24 → 1999 Aug 28 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering