Exchange interaction as the source of pairing in correlated electron systems: a brief overview

We address the question of real space pairing induced by exchange interaction, customarily associated with the presence of the broken-symmetry magnetism. For such mechanism of pairing, the appearance of superconductivity (or superfluidity) without magnetism presents itself still as a highly nontrivi...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 303; no. 1; pp. 012108 - 16
Main Author Spalek, Jozef
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 06.07.2011
Subjects
Approximation
Correlation
Exchange
Exchanging
Fermions
Kinetic energy
Magnetism
Mathematical analysis
Particle motion
Physics
Questions
Superconductivity
Superfluidity
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Summary:We address the question of real space pairing induced by exchange interaction, customarily associated with the presence of the broken-symmetry magnetism. For such mechanism of pairing, the appearance of superconductivity (or superfluidity) without magnetism presents itself still as a highly nontrivial problem and it seems, it can be practically realized only when the kinetic energy of individual-particle motion is comparable or even smaller than the magnitude of exchange interaction that takes place among strongly correlated fermions, where the kinetic exchange and/or the Hund's rule coupling can become relatively strong in the vicinity of the onset of the Mott insulating state. In that situation, the pairing arises from a coherent correlated pair motion rather than from a free motion of a tightly bound pair. We elaborate on this question in general terms, as well as provide selected results in the mean-field approximation in concrete situations.
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ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/303/1/012108