Center for Materials Theory, Department of Physics & Astronomy, Rutgers University, Piscataway New Jersey 08854, USA.
Phys Rev Lett. 2013 Nov 22;111(21):217003. doi: 10.1103/PhysRevLett.111.217003. Epub 2013 Nov 19.
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.
受铁基超导体中未补偿电子口袋中完全能隙超导的启发，我们提出了 ^{3}He-B 超流相的自旋单态，但轨道三重态类似物。我们表明，在硒位旋转时，铁位的标称 d 波对称的轨道三重态可以转变为 s 波对。这种 d(xy)和 d(x2-y(2))三重态的线性组合形成了一个完全能隙的拓扑超导体。预计在超导转变温度以下会出现拉曼活性激发。
