Microscopic Derivation of Two-Component Ginzburg-Landau Model and Conditions of its Applicability in Two-Band SystemsPhysical Review B (2011)
AbstractWe 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 accurate description of certain aspects of a two-band system even substantially far from $T_c$. This shows that 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 single Ginzburg-Landau parameter cannot in general characterize magnetic response of multiband systems.
Publication DateOctober 7, 2011
Citation InformationMihail Silaev and Egor Babaev. "Microscopic Derivation of Two-Component Ginzburg-Landau Model and Conditions of its Applicability in Two-Band Systems" Physical Review B Vol. 85 (2011)
Available at: http://works.bepress.com/egor_babaev/16/