GENERALIZED FULDE-FERRELL-LARKIN-OVCHINNIKOV STATE IN HEAVY-FERMION AND INTERMEDIATE-VALENCE SYSTEMS

Anomalous properties of the magnetization, the crystal dilatation, and other physical quantities observed in the mixed state of compounds su ch as UPd2Al3 and CeRu2 suggest the occurrence of a new state near H-c 2. In such compounds with large spin susceptibility and high H-c2, a n ew inhomogeneous superconducting state is theoretically predicted to o ccur in high magnetic fields. In this inhomogeneous state which is sho wn to be a generalized Fulde-Ferrell-Larkin-Ovchinnikov state, the ord er parameter is spatially modulated, and planar nodes of the order par ameter are periodically aligned perpendicular to the vortices. Various theoretical predictions are compared with experimental results on UPd 2Al3 and CeRu2 related to this new superconducting high-field state.