S. Takahashi et al., THEORY OF A GENERALIZED FULDE-FERRELL-LARKIN-OVCHINNIKOV STATE IN HEAVY-FERMION AND INTERMEDIATE-VALENCE SUPERCONDUCTORS, Physica. C, Superconductivity, 263(1-4), 1996, pp. 30-34
Anomalies in the magnetization and crystal dilatation have been observ
ed in the mixed state of UPd2Al3 and CeRu2. To explain the anomalies w
e study a superconducting system with large spin susceptibility. We pr
edict a new superconducting state in which the superconducting order p
arameter has a periodic array of planar nodes perpendicular to the vor
tices. The nature of this generalized Fulde-Ferrell-Larkin-Ovchinnikov
state is discussed in connection with the peak effect in the magnetiz
ation process of UPd2Al3 and CeRu2.