A polarised neutron scattering study of magnetic fluctuations in the heavy fermion superconductor CeCu2Si2 |
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| Authors: | S. M. Johnson J. A. C. Bland P. J. Brown A. Benoit H. Capellmann J. Flouquet H. Spille F. Steglich K. R. A. Ziebeck |
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| Affiliation: | (1) Institut Laue-Langevin, B.P. 156, F-38042 Grenoble, France;(2) Centre de Recherches sur les Très Basses Températures, CNRS, F-38042 Grenoble, France;(3) Institut für Theoretische Physik, Rhein.-Westfälische Technische Hochschule Aachen Erweiterungsgelände Seffent-Melaten, D-5100 Aachen, Germany;(4) Institut für Festkörperphysik, Technische Hochschule Darmstadt, D-6100 Darmstadt, Germany |
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| Abstract: | Magnetic fluctuations in CeCu2Si2 were directly observed, both above the superconducting transition temperatureTC as well as below. Spatial correlations of the magnetisation density belowTC are weak, resulting in an essentially wavevector independent magnetic response. The intensity observed within an energy window of ±5 THz centred on  =0 THz corresponds to 1µ per Ce atom. Higher energy excitations peaking between 7–10 THz were observed and are probably due to higher crystal field levels. |
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