Constraints Imposed by Symmetry on Pairing Operators for the Pnictides

Details Constraints Imposed by Symmetry on Pairing Operators for the Pnictides Constraints Imposed by Symmetry on Pairing Operators for the Pnictides

2010-02-23

arxiv.org/abs/1002.4335v2

Phys. Rev. B 81, 144509 (2010)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.81.144509

Considering model Hamiltonians that respect the symmetry properties of the pnictides, it is argued that pairing interactions that couple electrons at different orbitals with an orbital-dependent pairing strength inevitably lead to interband pairing matrix elements, at least in some regions of the Brillouin zone. Such interband pairing has not been considered of relevance in multiorbital systems in previous investigations. It is also observed that if, instead, a purely intraband pairing interaction is postulated, this requires that the pairing operator has the form $\Delta^+(k)=f(k) \sum_{\alpha} d^+_{k,\alpha,\uparrow}d^+_{-k, \alpha,\downarrow}$ where $\alpha$ labels the orbitals considered in the model and f(k) arises from the spatial location of the coupled electrons or holes. This means that the gaps at two different Fermi surfaces involving momenta $k_F$ and $k'_F$ can only differ by the ratio $f(k_F)/ f(k'_F)$ and that electrons in different orbitals must be subject to the same pairing attraction, thus requiring fine tuning. These results suggest that previously neglected interband pairing tendencies could actually be of relevance in a microscopic description of the pairing mechanism in the pnictides.

Affiliated with

Also associated with

No associations

Rating

Constraints Imposed by Symmetry on Pairing Operators for the Pnictides does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Constraints Imposed by Symmetry on Pairing Operators for the Pnictides, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constraints Imposed by Symmetry on Pairing Operators for the Pnictides will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-170378