THz and infrared spectroscopy is widely utilized to investigate the electrodynamic properties of the novel iron-based superconductors in the normal and superconducting states. Besides electronic excitations and correlations, electron-phonon coupling and the influence of magnetism, the experiments yield important information on low-lying excitations and help to clarify the number and symmetry of superconducting gaps. While the experimental data of different groups converge, the interpretation is still under debate. Here we review the status of optical investigations on the superconducting state for the 122 and 11 family of iron pnictides.
@article{arxiv.1004.2962,
title = {Looking at the superconducting gap of iron pnictides},
author = {Martin Dressel and Dan Wu and Neven Barisic and Boris Gorshunov},
journal= {arXiv preprint arXiv:1004.2962},
year = {2012}
}
Comments
6 pages, 3 figures; submitted to J. Phys. Chem. Solids, proceedings of the SNS2010 in Shanghai