Raman phonons in orthorhombic manganites

被引：11

作者：

de Andrés, A ^{[1
]}

Martínez, JL ^{[1
]}

Alonso, JM ^{[1
]}

Herrero, E ^{[1
]}

Prieto, C ^{[1
]}

Alonso, JA ^{[1
]}

Agulló, F ^{[1
]}

García-Hernández, M ^{[1
]}

机构：

[1] CSIC, Inst Ciencia Mat Madrid, E-28049 Madrid, Spain

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1999年 / 196卷

关键词：

optical phonons; Raman; magnetoresistance;

D O I：

10.1016/S0304-8853(98)00810-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have investigated the Raman phonons of several series of manganites: LaxMnyO3, La1-xCaxMnO3, RMnO3 (R = rare earth) with the (Pbmn) orthorhombic structure. Raman spectra of non-doped samples, RMnO3, correspond quite well with group theory analysis predictions but present anomalies in the width and intensity of several modes. The spectra of Ca-doped and non-stoichiometric samples are explained taking into account structural effects (both the disorder induced by doping and the reduction of the mean orthorhombic distortion) and the coupling of the phonons to the more or less delocalized e(g) electrons, related to polarons. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：453 / 454

页数：2

共 4 条

[1]

BABUISAUX I, IN PRESS

[2] Metal-insulator transition induced by oxygen isotope exchange in the magnetoresistive perovskite manganites [J].

Babushkina, NA ;

Belova, LM ;

Gorbenko, OY ;

Kaul, AR ;

Bosak, AA ;

Ozhogin, VI ;

Kugel, KI .

NATURE, 1998, 391 (6663) :159-161

[3] Raman spectroscopy of orthorhombic perovskitelike YMnO3 and LaMnO3 [J].

Iliev, MN ;

Abrashev, MV ;

Lee, HG ;

Popov, VN ;

Sun, YY ;

Thomsen, C ;

Meng, RL ;

Chu, CW .

PHYSICAL REVIEW B, 1998, 57 (05) :2872-2877

[4] Frequency shifts of the internal phonon modes in La0.7Ca0.3MnO3 [J].

Kim, KH ;

Gu, JY ;

Choi, HS ;

Park, GW ;

Noh, TW .

PHYSICAL REVIEW LETTERS, 1996, 77 (09) :1877-1880

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