1998/08/24 by R. Eder, Eder, R.
Physics and Astronomy · #Condensed Matter (cond-mat) #FOS: Physical sciences #Rare-earth and actinide compounds #cond-mat
paper · pdf · doi:10.48550/arxiv.cond-mat/9808261
RevTex-file, 4 PRB pages with 4 embedded eps files. Hardcopies of figures (or the entire manuscript) can be obtained by e-mail request to: [email protected]
arxiv created 1998/08/24 · openalex publication_date 1998/08/24 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.