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