Abstract
The phase diagrams on the temperature and magnetic field plane are examined in layered superconductors with antiferromagnetic subsystems in parallel magnetic fields. The field-induced superconductivity (FISC) occurs for strong Kondo coupling JK⪢zJ by the Jaccarino–Peter mechansim, where J denotes the antiferromagnetic coupling constant of the subsystem. The experimental phase diagram of λ-(BETS)2FeCl4 is semi-quantitatively reproduced by taking into account the Fulde–Ferrell–Larkin–Ovchinnikov state with an order-parameter mixing effect. On the other hand, for weak Kondo coupling, an enhancement of the upper critical field occurs instead of the FISC. In particular, for JK∼zJ⪢Δ0, the system is practically free from the paramagnetic pair-breaking effect, and very large areas of the superconductivity are obtained in the phase diagram.
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