Raman scattering study of electron-doped Pr${}_x$Ca${}_{1-x}$Fe${}_2$As${}_2$ superconductors

Abstract

Temperature-dependent polarized Raman spectra of electron-doped superconducting Pr${}_x$Ca${}_{1-x}$Fe${}_2$As${}_2$ ($x\approx 0.12$) single crystals are reported. All four allowed by symmetry even-parity phonons are identified. Phonon mode of B${}_{1g}$ symmetry at 222 cm${}^{-1}$, which is associated with the c-axis motion of Fe ions, is found to exhibit an anomalous frequency hardening at low temperatures, that signals non-vanishing electron-phonon coupling in the superconducting state and implies that the superconducting gap magnitude $2{\Delta }_c<27$meV.

4 pages, 3 figures

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• Raman Scattering Study of the Lattice Dynamics of Superconducting LiFeAs
• Raman scattering in iron-based superconductors
• Superconductivity-induced Phonon Renormalization on NaFe${}_{1-x}$Co${}_x$As
• The Hidden Nematic Fluctuations in the Triclinic (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 Superconductor Revealed by Ultrafast Optical Spectroscopy
• Evidence of superconductivity-induced phonon spectra renormalization in alkali-doped iron selenides
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