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Mean field analysis of a model for superconductivity in an anti-ferromagnetic background
KTH, Superseded Departments, Physics.
KTH, Superseded Departments, Physics.ORCID iD: 0000-0002-9881-7857
KTH, Superseded Departments, Physics.ORCID iD: 0000-0003-1164-0831
1998 (English)In: Physica. C, Superconductivity, ISSN 0921-4534, Vol. 296, 119-136 p.Article in journal (Refereed) Published
Abstract [en]

We study a lattice fermion model for superconductivity in the presence of an anti-ferromagnetic background, described as a fixed external staggered magnetic field. We discuss the possibility that our model provides an effective description of coexistence of anti-ferromagnetic correlations and superconductivity. and its possible application to high-temperature superconductivity. We also argue that, under certain conditions, this model describes a variant of the periodic Anderson model for heavy fermions. Using a path integral formulation we construct mean field equations, which we study in some detail. We evaluate the superconducting critical temperature and show thar it is strongly enhanced by anti-ferromagnetic order. We also evaluate the superconducting gap, the superconducting density of states, and the tunneling conductivity, and show that the most stable channel usually has a d(x2-y2)-wave gap.

Place, publisher, year, edition, pages
1998. Vol. 296, 119-136 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-12904OAI: oai:DiVA.org:kth-12904DiVA: diva2:319573
Note
QC 20100518Available from: 2010-05-18 Created: 2010-05-18 Last updated: 2010-05-18Bibliographically approved
In thesis
1. Ordering and phase transitions in models of high temperature superconductors
Open this publication in new window or tab >>Ordering and phase transitions in models of high temperature superconductors
1997 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 1997. viii, 24 p.
Series
Trita-FYS, ISSN 0280-316X ; 8022
Keyword
superconductivity, vortices, phase transitions, strongly correlated fermions, high temperature superconductivity
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-722 (URN)KTH/FYS/TEO/R--97/5--SE (ISRN)
Presentation
(English)
Note
QC 20100518Available from: 2000-09-26 Created: 2000-09-26 Last updated: 2010-05-18Bibliographically approved

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Lidmar, JackWallin, Mats

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