Electron-boson spectral density of LiFeAs obtained from optical data
arXiv:1412.5818 · doi:10.1088/0953-8984/27/5/055701
Abstract
We analyze existing optical data in the superconducting state of LiFeAs at 4 K, to recover its electron-boson spectral density. A maximum entropy technique is employed to extract the spectral density from the optical scattering rate. Care is taken to properly account for elastic impurity scattering which can importantly affect the optics in an -wave superconductor, but does not eliminate the boson structure. We find a robust peak in centered about 8.0 meV or 5.3 (with 17.6 K). Its position in energy agrees well with a similar structure seen in scanning tunneling spectroscopy (STS). There is also a peak in the inelastic neutron scattering (INS) data at this same energy. This peak is found to persist in the normal state at 23 K. There is evidence that the superconducting gap is anisotropic as was also found in low temperature angular resolved photoemission (ARPES) data.
arXiv comment17 pages, 6 figures
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