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28 March 2024
 
  » arxiv » cond-mat/0503142

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Evidence for short-range antiferromagnetic fluctuations in Kondo-insulating YbB12
J.-M. Mignot ; P. A. Alekseev ; K. S. Nemkovski ; L.-P. Regnault ; F. Iga ; T. Takabatake ;
Date 7 Mar 2005
Subject Strongly Correlated Electrons | cond-mat.str-el
Affiliation Laboratoire Leon Brillouin, CEA-CNRS, Saclay, France, Russian Research Centre "Kurchatov Institute", Moscow, Russia, DRFMC/SPSMS, CEA, Grenoble, France, ADSM, Hiroshima University, Japan
AbstractThe spin dynamics of mixed-valence YbB12 has been studied by inelastic neutron scattering on a high-quality single crystal. In the Kondo-insulating regime realized at low temperature, the spectra exhibit a spin-gap structure with two sharp, dispersive, in-gap excitations at E = 14.5 and approximately 20 meV. The lower mode is shown to be associated with short-range correlations near the antiferromagnetic wave vector q0 = (1/2, 1/2, 1/2). Its properties are in overall agreement with those expected for a "spin exciton’’ branch in an indirect hybridization gap semiconductor.
Source arXiv, cond-mat/0503142
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