Charge and Spin Pairing Instabilities in Hubbard Nanoclusters

A.N. Kocharian; G.W. Fernando; K. Palandage; J.W. Davenport

doi:10.4028/www.scientific.net/SSP.152-153.583

Paper Titles

Conditions for the Spin-Spiral State in Itinerant Magnets
p.559

A Fluctuating Field Theory for Systems of Localized Magnetic Moments
p.563

Impurity Assisted Interlayer Exchange Coupling in Iron/Silicon Multilayers
p.567

Investigation of the Critical Properties in the 3D Site-Diluted Potts Model
p.571

Investigation of the 3D ANNNI Model by Monte Carlo Methods
p.575

Temperature Hysteresis in the Dynamic Spin-Fluctuation Theory for Strong Ferromagnets
p.579

Charge and Spin Pairing Instabilities in Hubbard Nanoclusters
p.583

Magnetic and Structural Phase Transitions in Monochalcogenides of Uranium
p.587

Application of the Mean-Field Approximation to the Magnetic and Superconducting Phases of Quasi-One-Dimensional Metal
p.591

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Charge and Spin Pairing Instabilities in Hubbard Nanoclusters

Abstract:

Electron coherent and incoherent pairings and other types of correlations are studied exactly for the ensemble of small clusters with different geometries under variation of interaction strength, electron doping and temperature. Charge and spin collective excitations yield intriguing insights into level crossing degeneracies, phase separation and condensation. Criteria for spin-charge separation and recombination driven by interaction strength and temperature are found. Phase diagrams resemble a number of inhomogeneous, nanoscale phases and pseudogap regions seen recently in high TC cuprates, manganites, multiferroics and CMR nanomaterials.