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Doping dependence of the lattice dynamics in Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ studied by Raman spectroscopy
- Publication Year :
- 2009
- Publisher :
- arXiv, 2009.
-
Abstract
- We report Raman scattering spectra of iron-pnictide superconductor Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ single crystals with varying cobalt $x$ content. Upon cooling through the tetragonal-to-orthorhombic transition, we observe a large splitting of the E$_g$ in-plane phonon modes involving Fe and As displacements. The splitting of the in-plane phonons at the transition is strongly reduced upon doping and disappears for $x=0.06$ qualitatively following the trend displayed by the Fe magnetic moment. The origin of the splitting is discussed in terms of magnetic frustration inherent to iron-pnictide systems and we argue that such enhanced splitting may be linked to strong spin-phonon coupling.<br />Comment: 6 pages, 6 figures
- Subjects :
- Superconductivity (cond-mat.supr-con)
Condensed Matter - Strongly Correlated Electrons
Condensed Matter::Materials Science
Strongly Correlated Electrons (cond-mat.str-el)
Condensed Matter - Superconductivity
Condensed Matter::Superconductivity
FOS: Physical sciences
Condensed Matter::Strongly Correlated Electrons
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....3c09f7b54fbc124c6deeccc0df4f58dd
- Full Text :
- https://doi.org/10.48550/arxiv.0906.4569