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Microscopic derivation of two-component Ginzburg-Landau model and conditions of its applicability in two-band systems
KTH, Skolan för teknikvetenskap (SCI), Teoretisk fysik, Statistisk fysik.
KTH, Skolan för teknikvetenskap (SCI), Teoretisk fysik, Statistisk fysik.
2012 (engelsk)Inngår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 85, nr 13, s. 134514-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
2012. Vol. 85, nr 13, s. 134514-
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-95098DOI: 10.1103/PhysRevB.85.134514ISI: 000302855100005Scopus ID: 2-s2.0-84860205957OAI: oai:DiVA.org:kth-95098DiVA, id: diva2:527727
Forskningsfinansiär
Knut and Alice Wallenberg FoundationSwedish Research Council
Merknad
QC 20120522Tilgjengelig fra: 2012-05-22 Laget: 2012-05-14 Sist oppdatert: 2017-12-07bibliografisk kontrollert

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