Superconductivity in an Organic Insulator at Very High Magnetic Fields

L. Balicas; J. S. Brooks; K. Storr; S. Uji; M. Tokumoto; H. Tanaka; H. Kobayashi; A. Kobayashi; V. Barzykin; L. P. Gor'kov

doi:10.1103/PhysRevLett.87.067002

Superconductivity in an Organic Insulator at Very High Magnetic Fields

L. Balicas, J. S. Brooks, K. Storr, S. Uji, M. Tokumoto, H. Tanaka, H. Kobayashi, A. Kobayashi, V. Barzykin, L. P. Gor'kov

DOI 10.1103/PhysRevLett.87.067002 · Physical Review Letters

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Abstract

We investigate by electrical transport the field-induced superconducting state (FISC) in the organic conductor λ−(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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
λ-(BETS)2FeCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.2	Pressure not reported	onset
λ-(BETS)2GaCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown