Large-N solutions of the Heisenberg and Hubbard-Heisenberg models on the anisotropic triangular lattice: application to Cs2CuCl4 and to the layered organic superconductors kappa-(BEDT-TTF)(2)X (BEDT-TTF bis(ethylene-dithio)tetrathiafulvalene); X anion)

Chung, C. H., Marston, J. B. and McKenzie, R. H. (2001) Large-N solutions of the Heisenberg and Hubbard-Heisenberg models on the anisotropic triangular lattice: application to Cs2CuCl4 and to the layered organic superconductors kappa-(BEDT-TTF)(2)X (BEDT-TTF bis(ethylene-dithio)tetrathiafulvalene); X anion). Journal of Physics-condensed Matter, 13 22: 5159-5181. doi:10.1088/0953-8984/13/22/311


Author Chung, C. H.
Marston, J. B.
McKenzie, R. H.
Title Large-N solutions of the Heisenberg and Hubbard-Heisenberg models on the anisotropic triangular lattice: application to Cs2CuCl4 and to the layered organic superconductors kappa-(BEDT-TTF)(2)X (BEDT-TTF bis(ethylene-dithio)tetrathiafulvalene); X anion)
Journal name Journal of Physics-condensed Matter   Check publisher's open access policy
ISSN 0953-8984
Publication date 2001-01-01
Sub-type Article (original research)
DOI 10.1088/0953-8984/13/22/311
Volume 13
Issue 22
Start page 5159
End page 5181
Total pages 23
Editor J.E. Enderby
Place of publication United Kingdom
Publisher Institute of Physics Publishing
Language eng
Subject C1
240201 Theoretical Physics
780102 Physical sciences
Abstract We solve the Sp(N) Heisenberg and SU(N) Hubbard-Heisenberg models on the anisotropic triangular lattice in the large-N limit. These two models may describe respectively the magnetic and electronic properties of the family of layered organic materials K-(BEDT-TTF)(2)X, The Heisenberg model is also relevant to the frustrated antiferromagnet, Cs2CuCl4. We find rich phase diagrams for each model. The Sp(N) :antiferromagnet is shown to have five different phases as a function of the size of the spin and the degree of anisotropy of the triangular lattice. The effects of fluctuations at finite N are also discussed. For parameters relevant to Cs2CuCl4 the ground state either exhibits incommensurate spin order, or is in a quantum disordered phase with deconfined spin-1/2 excitations and topological order. The SU(N) Hubbard-Heisenberg model exhibits an insulating dimer phase, an insulating box phase, a semi-metallic staggered flux phase (SFP), and a metallic uniform phase. The uniform and SFP phases exhibit a pseudogap, A metal-insulator transition occurs at intermediate values of the interaction strength.
Keyword Physics, Condensed Matter
Frustrated Quantum Antiferromagnets
T-j Model
Phase-diagram
Ground-states
Spin-peierls
Chain
Excitations
Parameters
Conductors
Transition
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Organic Photonics and Electronics
School of Physical Sciences Publications
 
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Created: Wed, 15 Aug 2007, 01:40:22 EST