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Electron-boson spectral density of LiFeAs obtained from optical data

Title
Electron-boson spectral density of LiFeAs obtained from optical data
Authors
Hwang, J[Hwang, J.]Carbotte, JP[Carbotte, J. P.]Min, BH[Min, B. H.]Kwon, YS[Kwon, Y. S.]Timusk, T[Timusk, T.]
DGIST Authors
Min, BH[Min, B. H.]; Kwon, YS[Kwon, Y. S.]
Issue Date
2015-02-11
Citation
Journal of Physics Condensed Matter, 27(5)
Type
Article
Article Type
Article
Keywords
BosonsImpurity ScatteringLifeasLow TemperaturesMaximum Entropy MethodsNeutron ScatteringOptical DataOptical ScatteringScanning Tunneling MicroscopyScanning Tunneling SpectroscopyShear WavesSpectral DensitySuperconducting GapsSuperconducting StateTemperatureThe Electron-Boson Spectral Density
ISSN
0953-8984
Abstract
We analyze existing optical data in the superconducting state of LiFeAs at T'='4'K, to recover its electron-boson spectral density. A maximum entropy technique is employed to extract the spectral density I2χ(ω) from the optical scattering rate. Care is taken to properly account for elastic impurity scattering which can importantly affect the optics in an s-wave superconductor, but does not eliminate the boson structure. We find a robust peak in I2χ(ω) centered about ΩR≅' 8.0'meV or 5.3'kBTc (with Tc ='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 T'='23'K. There is evidence that the superconducting gap is anisotropic as was also found in low temperature angular resolved photoemission (ARPES) data. © 2015 IOP Publishing Ltd.
URI
http://hdl.handle.net/20.500.11750/2934
DOI
10.1088/0953-8984/27/5/055701
Publisher
Institute of Physics Publishing
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles


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