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Crystals 2012, 2(2), 248-265; doi:10.3390/cryst2020248
Review

Superconductivity in Layered Organic Metals

Hochfeld-Magnetlabor Dresden, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
Received: 6 March 2012 / Revised: 14 April 2012 / Accepted: 16 April 2012 / Published: 19 April 2012
(This article belongs to the Special Issue Molecular Conductors)
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Abstract

In this short review, I will give an overview on the current understanding of the superconductivity in quasi-two-dimensional organic metals. Thereby, I will focus on charge-transfer salts based on bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF or ET for short). In these materials, strong electronic correlations are clearly evident, resulting in unique phase diagrams. The layered crystallographic structure leads to highly anisotropic electronic as well as superconducting properties. The corresponding very high orbital critical field for in-plane magnetic-field alignment allows for the occurrence of the Fulde–Ferrell– Larkin–Ovchinnikov state as evidenced by thermodynamic measurements. The experimental picture on the nature of the superconducting state is still controversial with evidence both for unconventional as well as for BCS-like superconductivity.
Keywords: organic superconductors; electronic structure; superconducting state; Fulde–Ferrell–Larkin–Ovchinnikov state organic superconductors; electronic structure; superconducting state; Fulde–Ferrell–Larkin–Ovchinnikov state
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Wosnitza, J. Superconductivity in Layered Organic Metals. Crystals 2012, 2, 248-265.

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