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- Centre National de la Recherche ScientifiqueFR423 papers
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8 papers · 1 filter
Exact Ground State of Strongly Correlated Electron Systems from Symmetry-Entangled Wave-Functions
A. Leprévost, O. Juillet, R. Frésard
The four-site Hubbard model is considered from the exact diagonalisation and variational method points of view. It is shown that the exact ground-state can be recovered by a symmet…
Exotic spin, charge and pairing correlations of the two-dimensional doped Hubbard model: a symmetry entangled mean-field approach
Olivier Juillet, Raymond Frésard
Intertwining of spin, charge and pairing correlations in the repulsive two-dimensional Hubbard model is shown through unrestricted variational calculations, with projected wavefunc…
Exact results with the Kotliar-Ruckenstein slave-boson representation
Raymond Fresard, Thilo Kopp
Radial slave boson representations have the particular advantage that the expectation values of their respective fields are finite even without the formal introduction of spurious…
Slow Magnetic Order-Order Transition in the Spin Chain Antiferromagnet Ca3Co2O6
S. Agrestini, C. L. Fleck, L. C. Chapon +4
Using powder neutron diffraction we have discovered an unusual magnetic order-order transition in the Ising spin chain compound Ca3Co2O6. On lowering the temperature an antiferroma…
Interplay between magnetic properties and thermoelectricity in misfit and Na cobaltates
J. Bobroff, S. Hebert, G. Lang +3
We present a comparative study of CoO2 layers in the Bi-misfit and NaxCoO2 cobaltates. Co NMR measures the intrinsic susceptibility of the Co layers and is not affected by spurious…
Scaling behavior in thermoelectric misfit cobalt oxides
P. Limelette, S. Hebert, V. Hardy +3
We investigate both thermoelectric and thermodynamic properties of the misfit cobalt oxide [BiCoCaO]CoO. A large negative magnetother…