Theory of spin exciton in the Kondo semiconductor YbB12.

Abstract

The Kondo semiconductor YbB12 exhibits a spin and charge gap of approximately 15 meV. Close to the gap energy narrow dispersive collective excitations were identified by previous inelastic neutron scattering experiments. We present a theoretical analysis of these excitations. Starting from a periodic Anderson model for crystalline-electric-field- (CEF… (More)

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