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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 | Abstract: | The 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 | Services: | Forum | Review | PDF | Favorites |
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