2004/07/31 by R. Torsten Clay, R. T. Clay, S. Mazumdar
Chemistry · Materials Science · Physics and Astronomy · #Antiferromagnetism #Charge (physics) #Charge ordering #Chemistry #Condensed matter physics #Frustration #Hexagonal lattice #Lattice (music) #Magnetism #Magnetism in coordination complexes #Organic and Molecular Conductors Research #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Superconductivity #cond-mat.str-el
paper · pdf · doi:10.1016/j.synthmet.2005.07.327
published as Synthetic Metals 153, 445 (2005) · 4 pages, 4 eps figures, uses synmet.cls and elsart.cls (included). To appear in Synthetic Metals
arxiv created 2005/04/21 · openalex publication_date 2005/09/01 · arxiv updated 2014/07/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Strong commensurate antiferromagnetism proximate to superconductivity is found in some members of the kappa-(ET) family, while a spin gap (SG) is found in the theta-(ET). Both kappa- and theta-(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 kappa-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 \it cooperative charge and bond ordering transitions occurring at higher temperatures in these systems are taken into account. In the kappa-ET, this co-operative transition leads to unequal hole populations on the ET dimers that form the triangular lattice.