Physics – Condensed Matter – Superconductivity
Scientific paper
2011-11-29
J. Phys. Cond. Matt. 22, 255402 (2010)
Physics
Condensed Matter
Superconductivity
Scientific paper
We report temperature-dependent Raman spectra of CeFeAsO0.9F0.1 from 4 K to 300 K in spectral range of 60 to 1800 cm-1 and interpret them using estimates of phonon frequencies obtained from first-principles density functional calculations. We find evidence for a strong coupling between the phonons and crystal field excitations; in particular Ce3+ crystal field excitation at 432 cm-1 couples strongly with Eg oxygen vibration at 389 cm-1 . Below the superconducting transition temperature, the phonon mode near 280 cm-1 shows softening, signaling its coupling with the superconducting gap. The ratio of the superconducting gap to Tc thus estimated to be ~ 10 suggests CeFeAsO0.9F0.1 as a strong coupling superconductor. In addition, two high frequency modes observed at 1342 cm-1 and 1600 cm-1
Ganguli A. K.
Kumar Anil
Kumar Pradeep P.
Muthu D. V. S.
Prakash J.
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