Infrared phonon anomaly in BaFe2As2

被引：74

作者：

Akrap, A. ^{[1
]}

Tu, J. J. ^{[2
]}

Li, L. J. ^{[3
]}

Cao, G. H. ^{[3
]}

Xu, Z. A. ^{[3
]}

Homes, C. C. ^{[1
]}

机构：

[1] Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA

[2] CUNY City Coll, Dept Phys, New York, NY 10031 USA

[3] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 18期

基金：

美国国家科学基金会;

关键词：

barium compounds; iron compounds; magnetic transitions; optical conductivity; phonons; solid-state phase transformations; vibrational modes; SUPERCONDUCTIVITY; SYSTEMS;

D O I：

10.1103/PhysRevB.80.180502

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The detailed optical properties of BaFe2As2 have been determined over a wide frequency range above and below the structural and magnetic transition at T-N similar or equal to 138 K. A prominent in-plane infrared-active mode is observed at 253 cm(-1) (31.4 meV) at 295 K. The frequency of this vibration shifts discontinuously at T-N; for T < T-N the frequency of this mode displays almost no temperature dependence, yet it nearly doubles in intensity. This anomalous behavior appears to be a consequence of orbital ordering in the Fe-As layers.

引用

页数：4

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