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