Doping and temperature dependence of Raman scattering from NdFeAsO1-xFx (x=0-0.2) superconductor

被引：18

作者：

Zhang, L. ^{[1
]}

Fujita, T. ^{[1
]}

Chen, F. ^{[2
]}

Feng, D. L. ^{[2
]}

Maekawa, S. ^{[3
,4
]}

Chen, M. W. ^{[1
,3
]}

机构：

[1] Tohoku Univ, Adv Inst Mat Res, World Premier Int WPI Res Ctr, Sendai, Miyagi 9808577, Japan

[2] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China

[3] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[4] CREST Japan Sci Technol Agcy, Tokyo 1020075, Japan

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 05期

关键词：

doping profiles; fluorine; grain size; iron compounds; neodymium compounds; phonons; Raman spectra; superconducting materials; superconducting transition temperature; vibrational modes; 43; K; IRON; LAO1-XFXFEAS;

D O I：

10.1103/PhysRevB.79.052507

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Raman spectra of superconductor NdFeAsO1-xFx (x=0.0,0.1,0.2) compounds have been systematically investigated as functions of temperature and fluorine concentration. It was found that fluorine doping leads to structure disorder of insulator Nd-O layers and detectable downshift as well as increased temperature coefficients of the Fe-As vibrational modes. Additionally, low-temperature Raman measurements reveal that the in-plane phonon modes of the layered compound are unusually more sensitive to temperature change than those along the axis, and this anisotropic temperature dependence of phonon models is further enhanced by fluorine doping.

引用

页数：4

共 18 条

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