Singlet-triplet Hamiltonian for spin excitations in a Kondo insulator

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776110080169· OSTI ID:21443440

Maksimov, L A ^[1]

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1. Moscow Institute of Physics and Technology (Russian Federation)

In the nonsymmetric version of the periodic Anderson model for a Kondo insulator, an effective singlet-triplet Hamiltonian H{sub s-t} with indirect antiferromagnetic f-f exchange is constructed, which makes it possible to analyze the dynamic magnetic susceptibility {chi}{sub f}(k, {omega}) of f electrons. Hamiltonian H{sub s-t} is used to describe the experimentally observed dispersion of the three-level spin excitation spectrum in YbB{sub 12}. A distinguishing feature of this analysis is the introduction of small-radius singlet and triplet collective f-d excitations that form low- and high-lying spin bands during motion over the lattice.

• OSTI ID: 21443440
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 111, Issue 2; Other Information: DOI: 10.1134/S1063776110080169; Copyright (c) 2010 Pleiades Publishing, Ltd.; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
ABSORPTION SPECTRA
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
DIELECTRIC MATERIALS
ELECTRONIC STRUCTURE
ELECTRONS
EXCITATION
HAMILTONIANS
KONDO EFFECT
MAGNETIC SUSCEPTIBILITY
PERIODICITY
SPIN
TRIPLETS
YTTERBIUM BORIDES
ANGULAR MOMENTUM
BORIDES
BORON COMPOUNDS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
FERMIONS
LEPTONS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETISM
MATERIALS
MATHEMATICAL OPERATORS
MULTIPLETS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
QUANTUM OPERATORS
RARE EARTH COMPOUNDS
SPECTRA
VARIATIONS
YTTERBIUM COMPOUNDS