Magnetic-field-induced superconductivity in a two-dimensional organic conductor

S. Uji (), H. Shinagawa, T. Terashima, T. Yakabe, Y. Terai, M. Tokumoto, A. Kobayashi, H. Tanaka and H. Kobayashi
Additional contact information
S. Uji: National Research Institute for Metals
H. Shinagawa: National Research Institute for Metals
T. Terashima: National Research Institute for Metals
T. Yakabe: National Research Institute for Metals
Y. Terai: National Research Institute for Metals
M. Tokumoto: Electrotechnical laboratory
A. Kobayashi: Research Centre for Spectrochemistry, Graduate School of Science, The University of Tokyo
H. Tanaka: Institute for Molecular Science
H. Kobayashi: Institute for Molecular Science

Nature, 2001, vol. 410, issue 6831, 908-910

Abstract: Abstract The application of a sufficiently strong magnetic field to a superconductor will, in general, destroy the superconducting state. Two mechanisms are responsible for this. The first is the Zeeman effect1,2, which breaks apart the paired electrons if they are in a spin-singlet (but not a spin-triplet) state. The second is the so-called ‘orbital’ effect, whereby the vortices penetrate into the superconductors and the energy gain due to the formation of the paired electrons is lost3. For the case of layered, two-dimensional superconductors, such as the high-Tc copper oxides, the orbital effect is reduced when the applied magnetic field is parallel to the conducting layers4. Here we report resistance and magnetic-torque experiments on single crystals of the quasi-two-dimensional organic conductor λ-(BETS)2FeCl4, where BETS is bis(ethylenedithio)tetraselenafulvalene5,6,7,8. We find that for magnetic fields applied exactly parallel to the conducting layers of the crystals, superconductivity is induced for fields above 17 T at a temperature of 0.1 K. The resulting phase diagram indicates that the transition temperature increases with magnetic field, that is, the superconducting state is further stabilized with magnetic field.

Date: 2001
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DOI: 10.1038/35073531

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