Raman scattering study of (K${}_x$Sr${}_{1-x}$)Fe${}_2$As${}_2$ ($x$ = 0.0, 0.4)

Abstract

Polarized Raman spectra of non-superconducting SrFe${}_2$As${}_2$ and superconducting K${}_{0.4}$Sr${}_{0.6}$Fe${}_2$As${}_2$ ($T_c=37$ K) are reported. All four phonon modes (A${}_{1g}$ + B${}_{1g}$ + 2E${}_g$) allowed by symmetry, are found and identified. Shell model gives reasonable description of the spectra. No detectable anomalies are observed near the tetragonal-to-orthorhombic transition in SrFe${}_2$As${}_2$ or the superconducting transition in K${}_{0.4}$Sr${}_{0.6}$Fe${}_2$As${}_2$.

4 pages, 4 figures, 2 tables

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• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
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