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arXiv 0906.4569cond-mat.str-elcond-mat.supr-con
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Ba(Fe $_{1-x}$ Co $_x$)$_2$ As $_2$晶格动力学的掺杂拉曼光谱研究

Doping dependence of the lattice dynamics in Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ studied by Raman spectroscopy

L. Chauviere, Y. Gallais, M. Cazayous, A. Sacuto, M. A. Measson, D. Colson, A. Forget

摘要:

本文报道了铁磷族化合物超导体Ba(Fe $_{1-x}$ Co $_x$)$_2$ As $x$单晶的拉曼散射光谱。冷却时,通过四方到正交晶系的过渡,我们观察到一个大的分裂的E $_g$平面声子模式涉及Fe和As位移。面内声子的分裂在过渡强烈减少掺杂后,消失的$x=0.06$定性以下的Fe磁矩所显示的趋势。分裂的起源进行了讨论,在铁pnictide系统固有的磁挫折,我们认为,这种增强分裂可能与强自旋-声子耦合。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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