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On the anomalous pinning properties of the C15 Laves phase superconductor CeRu2

We report the anomalous field (H) dependence of pinning force density FP as deduced from our magnetization measurements on the single-crystal and polycrystalline samples of CeRu2. It is shown that, contrary to a single maximum in other hard type II superconductors, CeRu2 samples exhibit two distinct peak features in their FP-H plots. Our results show that the scaling of FP with the applied magnetic field at different temperatures cannot be described by the conventional Kramer model based on crossover from a line-breaking regime to a flux-line lattice shearing regime.