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VOLUME 69 | ISSUE 10 | PAGE 745
Anomalous electrodynamic response in the mixed-valence superconductor CeRu2
PACS: 74.25.Nf, 74.70.Ad
We report the first results of microwave magnetoabsorption measurements (35-140 GHz) in the intermediate-valence superconductor CeRu2The anomalous elec-trodynamic response is found to derive from a transition from a weak to a strong pinning regime in the superconducting mixed state of the unusual metal. The experimental results strongly support the appearance in the CeRu2 mixed state of a first-order phase transition that may be explained in terms of Fulde Ferrel Larkin Ovchinnikov state formation.