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

Abstract

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 $Yb{B}_{12}$. 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.

arXiv comment7 pages

References in corpus (3)

• Kondo insulators in the periodic Anderson model: a local moment approach
• Yb-Yb correlations and crystal-field effects in the Kondo insulator YbB12 and its solid solutions
• Theory of Spin Exciton in the Kondo Semiconductor $Yb{B}_{12}$