Raman spectroscopy as a probe of pairing symmetry in iron based superconductors |
| TYPE | Condensed Matter Seminar |
| Speaker: | Maxim Khodas |
| Affiliation: | HUJI |
| Date: | 20.01.2015 |
| Time: | 14:30 |
| Location: | Lidow Nathan Rosen (300) |
| Abstract: | I will start with review of Raman data on iron chalcogenides and pnictide high-Tc superconductors. Below Tc a sharp well defined in-gap modes are observed for cross polarized Raman beams. Next I constrain the possible pairing symmetry relying on this data as well as ARPES, and neutron scattering. The resulting picture is discussed leading to the sign-changing s-wave order parameter consistent with the data. The in-gap modes are interpreted as Bardasis-Schrieffer and particle-hole excitons respsectively. I conclude with the summary followed by a possible explanation of the normal state data on parent compounds, AFe2As2, with A=Sr,Eu. |