Abstract
We report the effect of a small hydrostatic pressure p ≅ 1.4 kBar on the temperature-magnetic field phase diagram of the organic conductor λ-(BETS) 2 FeCl 4 . At zero field a first-order superconducting (T c ≅ 5.6 K) to antiferromagnetic insulator transition (T N ≅ 4 K) is observed. The close proximity between both phases is suggestive of an unconventional superconducting pairing mechanism. Furthermore, the transition temperature towards the field-induced superconducting state (FISC), as well as its concomitant upper critical field, is found to increase by a factor of ∼ 33 %. The phase diagram of the FISC state for both p = 1 Bar and 1.4 kBar are well described in terms of the Jaccarino-Peter effect if the quasiparticle nature of the charge carriers is taken into account.
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