Electronic structure, insulator-metal transition and superconductivity in K-ET2X salts

V. A. Ivanov*, E. A. Ugolkova, M. Ye Zhuravlev, T. Hakioǧlu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The electronic structure and superconductivity of layered organic materials based on the bis(ethylenedithio)tetrathiafulvalene molecule (BEDT-TTF, hereafter ET) with essential intra-ET correlations of electrons are analysed. Taking into account the Fermi surface topology, the superconducting electronic density of states (DOS) is calculated for a realistic model of K-ET2X salts. A d-symmetry of the superconducting order parameter is obtained and a relation is found between its nodes on the Fermi surface and the superconducting phase characteristics. The results are in agreement with the measured non-activated temperature dependences of the superconducting specific heat and NMR relaxation rate of central 13C atoms in ET.

Original languageEnglish
Pages (from-to)53-60
Number of pages8
JournalAdvanced Materials for Optics and Electronics
Volume8
Issue number2
DOIs
Publication statusPublished - 1998
Externally publishedYes

Keywords

  • Dielectric-metal transition
  • Electron correlations
  • Fermi surface
  • Organic conductors
  • Superconductivity

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