109 research outputs found
Extended Uniform Ginzburg-Landau Theory for Novel Multiband Superconductors
The recently discovered multiband superconductors have created a new class of
novel superconductors. In these materials multiple superconducting gaps arise
due to the formation of Cooper pairs on different sheets of the Fermi surfaces.
An important feature of these superconductors is the interband couplings, which
not only change the individual gap properties, but also create new collective
modes. Here we investigate the effect of the interband couplings in the
Ginzburg-Landau theory. We produce a general expansion () and show that this expansion has unexpected behaviour for . This point emphasises the weaker validity of the GL theory for lower
temperatures and gives credence to the existence of hidden criticality near the
critical temperature of the uncoupled subdominant band.Comment: 10 pages, 4 figure
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