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Superconductivity from repulsive electronic correlations on alternant cuprate and iron-based lattices
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Theoretical Chemistry.
2013 (English)In: International Journal of Quantum Chemistry, ISSN 0020-7608, E-ISSN 1097-461X, Vol. 113, no 17, 2053-2059 p.Article in journal (Refereed) Published
Abstract [en]

A key question in the theory of high-temperature superconductivity is whether off-diagonal long-range order can be induced wholly or in large part by repulsive electronic correlations. Electron pairs on cuprate and the iron-based pnictide and chalcogenide alternant lattices may interact with a strong short-range Coulomb repulsion and much weaker longer range attractive tail. Here, we show that such interacting electrons can cooperate to produce a superconducting state in which time-reversed electron pairs effectively avoid the repulsive part but reside predominantly in the attractive region of the potential. The alternant lattice structure is a key feature of such a stabilization mechanism leading to the occurrence of high-temperature superconductivity with d(x2-y2) or sign alternating s-wave or s +/- condensate symmetries. 

Place, publisher, year, edition, pages
2013. Vol. 113, no 17, 2053-2059 p.
Keyword [en]
high Tc superconductivity, off-diagonal long-range order, cuprates, pnictides, Coulomb repulsion
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-206423DOI: 10.1002/qua.24437ISI: 000321982500003OAI: oai:DiVA.org:uu-206423DiVA: diva2:645746
Available from: 2013-09-05 Created: 2013-08-30 Last updated: 2017-12-06Bibliographically approved

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Brändas, Erkki J.

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