title: Superconductivity in an organic insulator at very high magnetic fields.
abstract: We investigate by electrical transport the field-induced superconducting state (FISC) in the organic conductor lambda-(BETS)2FeCl4. Below 4 K, antiferromagnetic-insulator, metallic, and eventually superconducting (FISC) ground states are observed with increasing in-plane magnetic field. The FISC state survives between 18 and 41 T and can be interpreted in terms of the Jaccarino-Peter effect, where the external magnetic field compensates the exchange field of aligned Fe3+ ions. We further argue that the Fe3+ moments are essential to stabilize the resulting singlet, two-dimensional superconducting state.
authors.affiliation: National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306, USA.
authors.forename: L
authors.initials: L
authors.lastname: Balicas
authors.forename: J S
authors.initials: JS
authors.lastname: Brooks
authors.forename: K
authors.initials: K
authors.lastname: Storr
authors.forename: S
authors.initials: S
authors.lastname: Uji
authors.forename: M
authors.initials: M
authors.lastname: Tokumoto
authors.forename: H
authors.initials: H
authors.lastname: Tanaka
authors.forename: H
authors.initials: H
authors.lastname: Kobayashi
authors.forename: A
authors.initials: A
authors.lastname: Kobayashi
authors.forename: V
authors.initials: V
authors.lastname: Barzykin
authors.forename: L P
authors.initials: LP
authors.lastname: Gor'kov