Theory of multiband superconductivity in spin-density-wave metals.
We study the emergence of multiband superconductivity with s- and d-wave symmetry on the background of a spin density wave (SDW). We show that the SDW coherence factors renormalize the momentum dependence of the superconducting (SC) gap, yielding a SC state with an unconventional s-wave symmetry. Interband Cooper pair scattering stabilizes superconductivity in both symmetries. With increasing SDW order, the s-wave state is more strongly suppressed than the d-wave state. Our results are universally applicable to two-dimensional systems with a commensurate SDW.
Ismer
J-P
JP
Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany.
Eremin
Ilya
I
Rossi
Enrico
E
Morr
Dirk K
DK
Blumberg
G
G