Microscopic derivation of two-component Ginzburg-Landau model and conditions of its applicability in two-band systems
2012 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 85, no 13, 134514- p.Article in journal (Refereed) Published
We report a microscopic derivation of two-component Ginzburg-Landau (GL) field theory and the conditions of its validity in two-band superconductors. We also investigate the conditions when microscopically derived or phenomenological GL models fail and one should resort to a microscopic description. We show that besides being directly applicable at elevated temperatures, a version of a minimal two-component GL theory in certain cases also gives an accurate description of certain aspects of a two-band system, even substantially far from T-c. This shows that a two-component GL model can be used for addressing a wide range of questions in multiband systems, in particular vortex physics and magnetic response. We also argue that a single Ginzburg-Landau parameter cannot in general characterize the magnetic response of multiband systems.
Place, publisher, year, edition, pages
2012. Vol. 85, no 13, 134514- p.
IdentifiersURN: urn:nbn:se:kth:diva-95098DOI: 10.1103/PhysRevB.85.134514ISI: 000302855100005ScopusID: 2-s2.0-84860205957OAI: oai:DiVA.org:kth-95098DiVA: diva2:527727
FunderKnut and Alice Wallenberg FoundationSwedish Research Council
QC 201205222012-05-222012-05-142012-05-22Bibliographically approved