Physics – Condensed Matter – Superconductivity
Scientific paper
2011-01-05
Physical Review Letters 106, 047005 (2011)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevLett.106.047005
Recent observation of unusual vortex patterns in MgB_2 single crystals raised speculations about a new type of superconductivity (named "type-1.5"). However, the strict application of the standard two-band Ginzburg-Landau (GL) theory results in simply proportional order parameters of the two bands - and does not support the "type-1.5" behavior. Here we derive the extended GL formalism (accounting all terms of the next order over the small t= 1- T/T_c parameter) for a two-band clean s-wave superconductor and show that the two condensates generally have different spatial scales, with difference disappearing only in the limit T -> T_c. The extended version of the two-band GL formalism improves the validity of GL theory below T_c, and suggests revisiting of the earlier calculations based on the standard model.
Milo\vsević M. V.
Peeters François M.
Shanenko A. A.
Vagov A. V.
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