Spin-gap magnetic response in (Yb, Lu)B12 |
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Authors: | E.V. Nefeodova P.A. Alekseev K.S. Nemkovski I.P. Sadikov N.Yu. Shitsevalova |
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Affiliation: | a RRC “Kurchatov Institute”, 123182 Moscow, Russia b Laboratoire Léon Brillouin, CEA-CNRS, CEA/Saclay, 91191 Gif sur Yvette, France c Institute of Materials Science, NASU, Kiev, Ukraine d Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK |
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Abstract: | To clarify the role of Yb-Yb correlations in the formation of the gap-like excitation spectrum of YbB12, the spin dynamics of strongly diluted Yb0.25Lu0.75B12 have been studied by inelastic neutron scattering in a wide temperature range. The data indicate that the spin gap is not suppressed by the dilution process even for large concentrations of Lu. However, the breaking-down of the Yb-sublattice periodicity leads to a strong smearing of the low-energy features and to a moderate suppression of the high-energy peak in the magnetic spectral response of YbB12. The interrelation of the spin and charge gaps is discussed. |
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Keywords: | Kondo insulator Inelastic neutron scattering Spin gap |
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