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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Schlott, M., Elschner, B., Herrmann, M. et al. ESR of Gd-impurities in the heavy fermion compounds CeCu2Si2 and CeAl3 . Z. Physik B - Condensed Matter 72, 385–389 (1988). https://doi.org/10.1007/BF01312826
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DOI: https://doi.org/10.1007/BF01312826