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Superconductivity in an organic insulator at very high magnetic fields. 2001
L Balicas, and
J S Brooks, and
K Storr, and
S Uji, and
M Tokumoto, and
H Tanaka, and
H Kobayashi, and
A Kobayashi, and
V Barzykin, and
L P Gor'kov
National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306, USA.
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.
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