TY - JOUR
T1 - Interface energy of two-band superconductors
AU - Geyer, Jani
AU - Fernandes, Rafael M.
AU - Kogan, V. G.
AU - Schmalian, Jörg
PY - 2010/9/27
Y1 - 2010/9/27
N2 - Using the Ginzburg-Landau theory for two-band superconductors, we determine the surface energy σs 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 Tc 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.
AB - Using the Ginzburg-Landau theory for two-band superconductors, we determine the surface energy σs 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 Tc 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.
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U2 - 10.1103/PhysRevB.82.104521
DO - 10.1103/PhysRevB.82.104521
M3 - Article
AN - SCOPUS:77957557411
VL - 82
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 1098-0121
IS - 10
M1 - 104521
ER -