Raman spectroscopy of ordered double perovskite La2CoMnO6 thin films

被引：204

作者：

Iliev, M. N. ^{[1
]}

Abrashev, M. V.

Litvinchuk, A. P.

Hadjiev, V. G.

Guo, H.

Gupta, A.

机构：

[1] Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA

[2] Univ Houston, Dept Phys, Houston, TX 77204 USA

[3] Univ Sofia, Fac Phys, Sofia 1164, Bulgaria

[4] Univ Alabama, Dept Chem, Tuscaloosa, AL 35487 USA

[5] Univ Alabama, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA

来源：

PHYSICAL REVIEW B | 2007年 / 75卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.75.104118

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Raman spectra of epitaxial thin films of La2CoMnO6 on (001)-oriented SrTiO3 substrates have been measured in several exact scattering configuration between 12 and 890 K. The polarization dependence of the spectra provide clear evidence for ordered P12(1)/n1 structure, differing from its parent Fm (3) over barm structure by the presence of rotational distortions. The correlation between the phonon modes in Fm <(3)over bar > m, R, and P12(1)/n1 phases is analyzed and the corresponding types of atomic motions as well as their expected frequency range are determined by comparison to the predictions of lattice dynamical calculations. The ferromagnetic ordering and spin-phonon coupling below T-C result in softening of some of the phonon modes. The evolution of the Raman spectra at high temperatures shows no indication for P12(1)/n1-R (3) over bar transition up to 800 K.

引用

页数：6

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