Year: 2008
Type: article
Abstract: Polarized Raman spectra of nonsuperconducting ${\text{SrFe}}_{2}{\text{As}}_{2}$ and superconducting ${\text{K}}_{0.4}{\text{Sr}}_{0.6}{\text{Fe}}_{2}{\text{As}}_{2}$ $({T}_{c}=37\text{ }\text{K})$ microcrystals are reported. All four-phonon modes $({A}_{1g}+{B}_{1g}+2{E}_{g})$ 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 ${\text{SrFe}}_{2}{\text{As}}_{2}$ or the superconducting transition in ${\text{K}}_{0.4}{\text{Sr}}_{0.6}{\text{Fe}}_{2}{\text{As}}_{2}$.
Source: Physical Review B
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1513423178