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Abstract:
Dilatometric and magnetic experiments on high-quality single crystals of
the superconducting compounds UPd2Al3 and CeRu2, which have enhanced
spin susceptibilities, demonstrate a first-order transition between weak
and strong pinning at T < 0.9T(c) (H > 10 kOe). This is compatible with
a staggered order parameter due to the formation of a
''Fulde-Ferrell-Larkin-Ovchinnikov'' state.