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Tetrahedral and orbital pairing: a fully gapped pairing scenario for the iron-based superconductors
1Center for Materials Theory, Department of Physics & Astronomy, Rutgers University, Piscataway New Jersey 08854, USA.
Abstract:
Motivated by the fully gapped superconductivity in iron-based superconductors with uncompensated electron pockets, we propose a spin singlet, but orbital triplet analogue of the superfluid phase of ^{3}He-B. We show that orbital triplets with a nominal d-wave symmetry at the iron sites can transform as s-wave pairs under rotations about the selenium sites. Linear combinations of such d(xy) and d(x2-y(2)) triplets form a fully gapped, topological superconductor. Raman-active excitations are predicted to develop below the superconducting transition temperature.
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