Dynamical magnetic correlations in the YbB12 kondo insulator: Neutron investigations with a polarization analysis |
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| Authors: | P A Alekseev K S Nemkovski J -M Mignot A S Ivanov E V Nefeodova I P Sadikov F Iga T Takabatake |
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| Institution: | (1) Russian Research Centre “Kurchatov Institute,”, pl. Akademika Kurchatova 1, Moscow, 123182, Russia;(2) Laboratoire Léon Brillouin, CEA/Saclay, Gif sur Yvette, F-91191, France;(3) Institut Laue-Langevin, BP 156, Grenoble Cedex-9, F-38042, France;(4) Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8526, Japan |
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| Abstract: | The results of investigations into the spin dynamics in the YbB12 Kondo insulator with the use of inelastic neutron scattering, including experiments with a polarization analysis, are discussed. It is shown that, at low temperatures, the dynamic magnetic response in the structure of the YbB12 Kondo insulator is characterized by three dispersive excitations with a nontrivial q-dependence of the intensity. An increase in the temperature results in a crossover to the single-site spin fluctuation regime accompanied by suppression of collective excitations. |
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