Spin Gap in a Doped Kondo Chain

Details Spin Gap in a Doped Kondo Chain Spin Gap in a Doped Kondo Chain

1997-02-15

arxiv.org/abs/cond-mat/9702143v3

Phys. Rev. Lett. 79 (1997) 929-32.

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages RevTeX including 4 eps figures; minor corrections and clarifications

Scientific paper

10.1103/PhysRevLett.79.929

We show that the Kondo chain away from half-filling has a spin gap upon the introduction of an additional direct Heisenberg coupling between localized spins. This is understood in the weak-Kondo-coupling limit of the Heisenberg-Kondo lattice model by bosonization and in the strong-coupling limit by a mapping to a modified t-J model. Only for certain ranges of filling and Heisenberg coupling does the spin gap phase extend from weak to strong coupling.

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