期刊
PHYSICAL REVIEW B
卷 80, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.094504
关键词
barium compounds; cobalt compounds; cooling; doping; frustration; high-temperature superconductors; iron compounds; magnetic moments; Raman spectra; solid-state phase transformations; spin-phonon interactions
We report Raman scattering measurements on iron-pnictide superconductor Ba(Fe1-xCox)(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.
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