Doping dependence of the lattice dynamics in Ba(Fe1-xCox)2As2 studied by Raman spectroscopy

被引：79

作者：

Chauviere, L. ^{[1
]}

Gallais, Y. ^{[1
]}

Cazayous, M. ^{[1
]}

Sacuto, A. ^{[1
]}

Measson, M. A. ^{[1
]}

Colson, D. ^{[2
]}

Forget, A. ^{[2
]}

机构：

[1] Univ Paris Diderot, CNRS, UMR 7162, Lab Mat & Phenomenes Quant, F-75205 Paris 13, France

[2] CEA Saclay, Serv Phys Etat Condense, DSM DRECAM SPEC, F-91191 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 09期

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; SPIN-PHONON INTERACTION; SUPERCONDUCTIVITY; FERROPNICTIDES;

D O I：

10.1103/PhysRevB.80.094504

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：6

共 30 条

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