Interface energy of two-band superconductors

TitleInterface energy of two-band superconductors
Publication TypeJournal Article
Year of Publication2010
AuthorsGeyer J, Fernandes RM, Kogan VG, Schmalian J
Journal TitlePhysical Review B
Date Published09/27
ISBN Number1098-0121
Accession NumberISI:000282168100009
KeywordsBORON, gaps, ginzburg-landau theory, mgb2, state, yni2b2c

Using the Ginzburg-Landau theory for two-band superconductors, we determine the surface energy sigma(s) between coexisting normal and superconducting states at the thermodynamic critical magnetic field. Close to the transition temperature, where the Ginzburg-Landau theory is applicable, we demonstrate that the two-band problem maps onto an effective single band problem. While the order parameters of the two bands may have different amplitudes in the homogeneous bulk, near T-c the Josephson-type coupling between the bands leads to the same spatial dependence of both order parameters near the interface. This finding puts into question the possibility of intermediate, so-called type-1.5 superconductivity, in the regime where the Ginzburg-Landau theory applies.

URL<Go to ISI>://000282168100009
Alternate JournalPhys Rev B