Dual fermion calculations show that K-point antiferromagnetic spin fluctuations of the half-filled triangular Hubbard model persist from the insulator into the metal, and the computed spectra match qualitative features of neutron and NMR experiments.
Theory of triangular lattice quasi-one-dimensional charge-transfer solids
1 Pith paper cite this work. Polarity classification is still indexing.
1
Pith paper citing it
abstract
Recent investigations of the magnetic properties and the discovery of superconductivity in quasi-one-dimensional triangular lattice organic charge-transfer solids have indicated the severe limitations of the effective 1/2-filled band Hubbard model for these and related systems. Our computational studies of these materials within a 1/4-filled band Hubbard model in which the organic monomer molecules, and not their dimers, constitute the sites of the Hamiltonian are able to reproduce the experimental results. We ascribe the spin gap transition in kappa-(BEDT-TTF)_2B(CN)_4 to the formation of a two-dimensional paired-electron crystal and make the testable prediction that the spin gap will be accompanied by charge-ordering and period doubling in two directions. We find enhancement of the long-range component of superconducting pairing correlations by the Hubbard repulsive interaction for band parameters corresponding to kappa-(BEDT-TTF)_2CF_3SO_3. The overall results strongly support a valence bond theory of superconductivity we have proposed recently.
citation-role summary
background 1
citation-polarity summary
fields
cond-mat.str-el 1years
2019 1verdicts
CONDITIONAL 1roles
background 1polarities
unclear 1representative citing papers
citing papers explorer
-
Magnetic and charge susceptibilities in the half-filled triangular lattice Hubbard model
Dual fermion calculations show that K-point antiferromagnetic spin fluctuations of the half-filled triangular Hubbard model persist from the insulator into the metal, and the computed spectra match qualitative features of neutron and NMR experiments.