Strong electronic correlations in superconducting organic charge transfer salts

Powell, B. J. and McKenzie, R. H. (2006) Strong electronic correlations in superconducting organic charge transfer salts. Journal of Physics-condensed Matter, 18 45: R827-R866. doi:10.1088/0953-8984/18/45/R03


Author Powell, B. J.
McKenzie, R. H.
Title Strong electronic correlations in superconducting organic charge transfer salts
Journal name Journal of Physics-condensed Matter   Check publisher's open access policy
ISSN 0953-8984
Publication date 2006-01-01
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1088/0953-8984/18/45/R03
Volume 18
Issue 45
Start page R827
End page R866
Total pages 40
Editor A M Stoneham
Place of publication United Kingdom
Publisher Institute of Physics Publishing Ltd
Language eng
Subject C1
240204 Condensed Matter Physics - Other
780102 Physical sciences
Abstract We review the role of strong electronic correlations in quasi-two-dimensional organic charge transfer salts such as (BEDT-TTF)(2)X, (BETS)(2)Y, and beta'-[Pd(dmit)(2)](2)Z. We begin by defining minimal models for these materials. It is necessary to identify two classes of material: the first class is strongly dimerized and is described by a half-filled Hubbard model; the second class is not strongly dimerized and is described by a quarter-filled extended Hubbard model. We argue that these models capture the essential physics of these materials. We explore the phase diagram of the half-filled quasi-two-dimensional organic charge transfer salts, focusing on the metallic and superconducting phases. We review work showing that the metallic phase, which has both Fermi liquid and 'bad metal' regimes, is described both quantitatively and qualitatively by dynamical mean field theory (DMFT). The phenomenology of the superconducting state is still a matter of contention. We critically review the experimental situation, focusing on the key experimental results that may distinguish between rival theories of superconductivity, particularly probes of the pairing symmetry and measurements of the superfluid stiffness. We then discuss some strongly correlated theories of superconductivity, in particular the resonating valence bond (RVB) theory of superconductivity. We conclude by discussing some of the major challenges currently facing the field. These include parameterizing minimal models, the evidence for a pseudogap from nuclear magnetic resonance (NMR) experiments, superconductors with low critical temperatures and extremely small superfluid stiffnesses, the possible spin- liquid states in kappa-(ET)(2)Cu-2(CN)(3) and beta'-[Pd(dmit)(2)](2)Z, and the need for high quality large single crystals.
Keyword Physics, Condensed Matter
High-temperature Superconductivity
D-wave Superconductors
High Magnetic-fields
Anisotropic Triangular Lattice
Density-of-states
Geometrically Frustrated Magnets
Metal-insulator-transition
Ab-initio Evaluation
Bedt-ttf Salts
Thermal-conductivity
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 19:47:50 EST