Polarized Raman spectra of nonsuperconducting SrFe2 As2 and superconducting K0.4 Sr0.6 Fe2 As2 (Tc =37K) microcrystals are reported. All four-phonon modes (A1g + B1g +2 Eg) 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 SrFe2 As2 or the superconducting transition in K0.4 Sr0.6 Fe2 As2.
|期刊||Physical Review B - Condensed Matter and Materials Physics|
|出版狀態||Published - 2008 8月 14|
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