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Coherent and incoherent pairing instabilities and spin-charge separation in bipartite and nonbipartite nanoclusters: Exact results

Kocharian, A. N. and Fernando, G. W. and Palandage, K. and Davenport, J. W. (2008) Coherent and incoherent pairing instabilities and spin-charge separation in bipartite and nonbipartite nanoclusters: Exact results. PHYSICAL REVIEW B, 78 (7). ISSN 10980121

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Official URL: http://link.aps.org/doi/10.1103/PhysRevB.78.075431...

Abstract

Electron pairing and formation of various types of magnetic correlations for ensembles of small clusters of different geometries are studied with emphasis on tetrahedrons and square pyramids under variation of interaction strength, electron doping and temperature. These exact calculations of charge and spin collective excitations and pseudogaps yield intriguing insights into level crossing degeneracies, phase separation and condensation. Obtained coherent and incoherent pairings provide a route for possible superconductivity different from the conventional BCS theory. Criteria for spin-charge separation, reconciliation and recombination driven by interaction strength, next-nearest coupling and temperature are found. Resulting phase diagrams resemble a number of inhomogeneous, coherent and incoherent nanoscale phases seen recently in high-T-c cuprates, manganites and colossal magnetoresistive (CMR) nanomaterials.

Item Type:Article
Subjects:Physical Science > Nanoelectronics
Physical Science > Nanomagnetics
ID Code:131
Deposited By:Lesley Tobin
Deposited On:21 Nov 2008 15:41
Last Modified:03 Feb 2009 11:33

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