Theory of magnetic excitations in the Kondo lattice

Details Theory of magnetic excitations in the Kondo lattice Theory of magnetic excitations in the Kondo lattice

1998-08-24

arxiv.org/abs/cond-mat/9808261v1

Physics

Condensed Matter

RevTex-file, 4 PRB pages with 4 embedded eps files. Hardcopies of figures (or the entire manuscript) can be obtained by e-mail

Scientific paper

We present a theory for the spin excitations of the Kondo lattice. We derive an effective Hamiltonian, which describes Fermionic spin 1/2 charge fluctuations interacting with Bosonic triplet spin fluctuations. We show that already the simplest approximation possible, i.e. replacing the magnon self-energy by the free polarization bubble for the charge excitation Greens function, gives a quantitative description of the `spin gap' and `charge gap' as obtained in numerical calculations for the Kondo insulator.

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