Superconductivity in an organic insulator at very high magnetic fields

Details Superconductivity in an organic insulator at very high magnetic fields Superconductivity in an organic insulator at very high magnetic fields

2001-03-22

arxiv.org/abs/cond-mat/0103463v1

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages 3 figures

Scientific paper

10.1103/PhysRevLett.87.067002

We investigate by electrical transport the field-induced superconducting state (FISC) in the organic conductor $\lambda$-(BETS)$_2$FeCl$_4$. 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 {\em compensates} the exchange field of aligned Fe$^{3+}$ ions. We further argue that the Fe$^{3+}$ moments are essential to stabilize the resulting singlet, two-dimensional superconducting state

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