Asymmetric Anderson model and spin excitations in the Kondo insulator YbB{sub 12}

Journal Article · Wed Jul 15 00:00:00 EDT 2009 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776109070127· OSTI ID:21443702

Maksimov, L A ^[1]

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1. Kurchatov Institute Russian Research Center (Russian Federation)

A cluster problem is analyzed as an example demonstrating that the observed three-mode behavior of spin-triplet excitations in YbB{sub 12} can be described by the asymmetric Anderson model with insulating singlet ground state. In the case of an infinite system, it is argued that the behavior of the f subsystem can be analyzed by using an effective Hamiltonian H{sub J} with direct antiferromagnetic f-f exchange interaction. The spin excitation spectrum is shown to have a minimum at the antiferromagnetic vector, as observed experimentally. A distinctive feature of the analysis is the use of singlet and triplet basis operators.

• OSTI ID: 21443702
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 109, Issue 1; Other Information: DOI: 10.1134/S1063776109070127; Copyright (c) 2009 Pleiades Publishing, Ltd.; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
ANTIFERROMAGNETISM
ASYMMETRY
DIELECTRIC MATERIALS
EXCHANGE INTERACTIONS
EXCITATION
HAMILTONIANS
KONDO EFFECT
SPIN
TRIPLETS
YTTERBIUM BORIDES
ANGULAR MOMENTUM
BORIDES
BORON COMPOUNDS
ENERGY-LEVEL TRANSITIONS
INTERACTIONS
MAGNETISM
MATERIALS
MATHEMATICAL OPERATORS
MULTIPLETS
PARTICLE PROPERTIES
QUANTUM OPERATORS
RARE EARTH COMPOUNDS
SPECTRA
YTTERBIUM COMPOUNDS