ESR of Gd-impurities in the heavy fermion compounds CeCu2Si2 and CeAl3 |
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Authors: | M. Schlott B. Elschner M. Herrmann W. Assmus |
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Affiliation: | (1) Institut für Festkörperphysik, Technische Hochschule Darmastadt, Hochschulstrasse 2, D-6100 Darmstadt, Federal Republic of Germany;(2) Physikalisches Institut, Universität Frankfurt, Robert-Mayer-Strasse 2-4, D-6000 Frankfurt, Federal Republic of Germany |
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Abstract: | The heavy fermion systems CeCu2Si2 and CeAl3 are characterized by a huge quasiparticle density of states responsible for the large electronic specific heat. The observation of a Gd3+ electron spin resonance (ESR) in single crystals CeCu2Si2 and in polycrystalline CeAl3 clearly demonstrates the local character of these quasiparticles. Nevertheless, the Gd-spin relaxation shows remarkable anomalies with respect to the isostructural compounds LaCu2Si2 and LaAl3: Probably via RKKY coupling, Ce 4f-spin fluctuations give rise to an enhanced Gd-spin relaxation resulting in an unusual non-linear thermal broadening around the Kondo temperature. From this we obtain information about the temperature dependence of the Ce 4f-spin correlation time. |
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