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We report inelastic light scattering experiments on superconductorCe0.6Y0.4FeAsO0.8F0.2 from 4K to 300K covering the superconducting transitiontemperature Tc ~ 48.6K. A strong evidence of the superconductivity inducedphonon renormalization for the A1g phonon mode near 150 cm-1 associated withthe Ce/Y vibrations is observed as reflected in the anomalous red-shift anddecrease in the linewidth below Tc. Invoking the coupling of this mode with thesuperconducting gap, the superconducting gap (2) at zero temperature isestimated to be ~ 20 meV i.e the ratio is ~ 5, suggesting Ce0.6Y0.4FeAsO0.8F0.2to belong to the class of strong coupling superconductors. In addition, themode near 430 cm-1 associated with Ce3+ crystal field excitation also showsanomalous increase in its linewidth below Tc suggesting strong coupling betweencrystal field excitation and the superconducting quasi-particles. Ourobservations of two high frequency modes (S9 and S10) evidence thenon-degenerate nature of Fe2+ dxz/yz orbitals suggesting the electronicnematicity in these systems.

Raman evidence for coupling of superconducting quasi-particles with a phonon and crystal field excitation in superconductor Ce0.6Y0.4FeAsO0.8F0.2