Possible interplay between a two phonon mode and high energy magnetic excitations in BiFeO3

被引：23

作者：

Cazayous, M. ^{[1
]}

Sacuto, A. ^{[1
]}

Lebeugle, D. ^{[2
]}

Colson, D. ^{[2
]}

机构：

[1] Univ Paris 07, Lab Mat & Phenomenes Quant, CNRS, UMR 7162, F-75205 Paris 13, France

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

来源：

EUROPEAN PHYSICAL JOURNAL B | 2009年 / 67卷 / 02期

关键词：

77.80.Bh Phase transitions and Curie point; 75.50.Ee Antiferromagnetics; 75.25.+z Spin arrangements in magnetically ordered materials; 78.30.Hv Other nonmetallic inorganics;

D O I：

10.1140/epjb/e2009-00033-7

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have performed Raman measurements on high energy excitations in BiFeO3 single crystals as a function of both temperature and laser excitation lines. A strong feature observed at 1250 cm(-1) in the Raman spectra has been previously assigned to two phonon overtone. This peak exhibits an unusual frequency shift with the laser lines and the temperature dependence of its Fano lineshape shows two singularities at 150 K and 200 K which can be related to magnetic excitations. In the same energy range, we have also identified the two-magnon excitation with a temperature dependence very similar to the one measured for the one-magnon modes.

引用

页码：209 / 212

页数：4

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