Mean field analysis of a model for superconductivity in an anti-ferromagnetic background
1998 (English)In: Physica. C, Superconductivity, ISSN 0921-4534, Vol. 296, 119-136 p.Article in journal (Refereed) Published
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.
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-12904OAI: oai:DiVA.org:kth-12904DiVA: diva2:319573
QC 201005182010-05-182010-05-182010-05-18Bibliographically approved