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Electron-boson spectral density of LiFeAs obtained from optical data | | J. Hwang
; J. P. Carbotte
; B. H. Min
; Y. S. Kwon
; T. Timusk
; | | Date: |
18 Dec 2014 | | 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 $I^2chi(omega)$ 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 $I^2chi(omega)$ centered about $Omega_R cong$ 8.0 meV or 5.3 $k_B
T_c$ (with $T_c =$ 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. | | Source: | arXiv, 1412.5818 | | Services: | Forum | Review | PDF | Favorites | |
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