Singlet-triplet Hamiltonian for spin excitation in the Kondo-insulator

Details Singlet-triplet Hamiltonian for spin excitation in the Kondo-insulator Singlet-triplet Hamiltonian for spin excitation in the Kondo-insulator

2009-11-12

arxiv.org/abs/0911.2348v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages

Scientific paper

Within the framework of periodic asymmetric Anderson model for Kondo isoulators an effective singlet-triplet Hamiltonian with indirect antiferromagnetic f-f exchange interaction is introduced which allows to study analytically the dynamic magnetic susceptibilities of f-electrons. The approach allows to describe the three-level spin excitation spectrum with a specific dispersion in $YbB_{12}$. Distinctive feature of the consideration is the introduction of small radius singlet and triplet collective f-d excitations which at movement on a lattice form low - and high-energy spin bands.

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