The pnictide superconductor SrPtAs has a hexagonal layered structure containing inversion symmetry. It is formed by stacking two inequivalent PtAs layers separated by Sr layers. The former have no local (in-plane) inversion symmetry and therefore a (layer-) staggered Rashba spin orbit coupling appears which splits the three Kramers degenerate bands into six quasi-2D bands. The symmetry of the superconducting state of SrPtAs is unknown. Three candidates, spin-singlet A1g and Eg as well as triplet A2u states have been proposed. We predict the quasiparticle interference (QPI) spectrum for these gap functions in t-matrix Born approximation. We show that distinct differences in the pattern of characteristic QPI wave vectors appear. These results may be important to determine the gap symmetry of SrPtAs by STM-QPI method.
@article{arxiv.1404.3085,
title = {Gap function of hexagonal pnictide superconductor SrPtAs from quasiparticle interference spectrum},
author = {Alireza Akbari and Peter Thalmeier},
journal= {arXiv preprint arXiv:1404.3085},
year = {2014}
}