Strong-coupling expansion for a Kondo-lattice model
- 1 November 1984
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 30 (9), 5383-5385
- https://doi.org/10.1103/physrevb.30.5383
Abstract
We consider a single tight-binding band of electrons interacting with localized spin-½ magnetic moments at every lattice site. We assume that in zeroth order the system is well described by noninteracting Kondo singlets, and discuss an expansion in the electron-hopping matrix element. To second order, the bandwidth is renormalized by a factor of 2, and an effective interaction between the singlets results. We discuss the properties of the model as a function of band filling, Kondo coupling, and Hubbard electron-electron interaction. In particular, we find that the system could exhibit a charge-density-wave ground state or triplet superconductivity for certain ranges of parameters.Keywords
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