2016/11/14 by S. Maiti, T. A. Maier, T. Boehm +2 · 1 citation
Physics and Astronomy · #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.117.257001
published as Phys. Rev. Lett. 117, 257001 (2016) · 5pp+7pp, 4 figures
arxiv created 2016/11/14 · arxiv updated 2017/01/04
In unconventional superconductors, understanding the form of the pairing interaction is the primary goal. In this regard, Raman spectroscopy is a very useful tool, as it identifies the ground state and also the subleading pairing channels by probing collective modes. Here we propose a general theory for multiband Raman response and identify new features in the spectrum that can provide a robust test for a pairing theory. We identify multiple Bardasis-Schrieffer type collective modes and connect the weights of these modes to the sub-leading gap structures within a microscopic pairing theory. The conclusions are completely general, and we apply our approach to interpret the B1g Raman scattering in hole-doped BaFe2As2.