Magnetism in BEDT-TTF materials

R. T. Clay, S. Mazumdar

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Strong commensurate antiferromagnetism proximate to superconductivity is found in some members of the κ-(ET) family, while a spin gap (SG) is found in the θ-(ET). Both κ- and θ-(ET) materials have frustrated triangular lattice structures. We show from calculations of spin-spin correlations within the effective half-filled band triangular lattice proposed for the κ-ET, as well as for the real lattice, that long range AFM order is not obtained as a consequence of this frustration. We argue that some other mechanism reduces the magnetic frustration in these systems. We show that the low temperature magnetic states in these materials can only be understood if the effects of the cooperative charge and bond ordering transitions occurring at higher temperatures in these systems are taken into account. In the κ-ET, this co-operative transition leads to unequal hole populations on the ET dimers that form the triangular lattice.

Original languageEnglish (US)
Pages (from-to)445-448
Number of pages4
JournalSynthetic Metals
Volume153
Issue number1-3
DOIs
StatePublished - Sep 21 2005

Keywords

  • Organic conductors based on radical cation and/or anion salts
  • Organic superconductors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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