On the resistance maximum in high-TcK-(BEDT-TTF)2Cu(NCS)2

N. Toyota, T. Sasaki

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

To explain the resistance maximum around 100 K observed in a title superconductor of highly correlated Fermi liquid, we present a quasi-particle band model. The band is assumed to be symmetrically split with respect to the Fermi level, due to the inter-site Coulomb interaction V (typically 0.2-0.5 eV). As the temperature is lowered or the pressure is applied, the transfer integrals increase as a consequence of the lattice contraction. This leads to an increase in the width of each split subbands, WSB (∼0.2 eV), and hence reduces the gap EG of ( 1 2) (V-WSB). The resistance maximum is thus understood as an insulator-to-metal transition and numerical calculations of the number density of carriers well reproduce the experiments with positive EG = 300-500 K at room temperature and negative (band-overlapped) EG =-(200-300) K at helium temperature.

Original languageEnglish
Pages (from-to)361-365
Number of pages5
JournalSolid State Communications
Volume74
Issue number5
DOIs
Publication statusPublished - 1990 May

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

Fingerprint Dive into the research topics of 'On the resistance maximum in high-T<sub>c</sub>K-(BEDT-TTF)<sub>2</sub>Cu(NCS)<sup>2</sup>'. Together they form a unique fingerprint.

Cite this