Investigation of phonon behavior in Pr2NiMnO6 by micro-Raman spectroscopy

被引：30

作者：

Truong, K. D. ^{[1
]}

Singh, M. P. ^{[1
]}

Jandl, S. ^{[1
]}

Fournier, P. ^{[1
]}

机构：

[1] Univ Sherbrooke, Dept Phys, Sherbrooke, PQ J1K 2R1, Canada

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2011年 / 23卷 / 05期

基金：

加拿大创新基金会; 加拿大自然科学与工程研究理事会;

关键词：

TEMPERATURE; PEROVSKITES; SCATTERING; LA2NIMNO6; OXIDES;

D O I：

10.1088/0953-8984/23/5/052202

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The temperature dependence of phonon excitations and the presence of spin-phonon coupling in polycrystalline Pr2NiMnO6 samples were studied using micro-Raman spectroscopy and magnetometry. Magnetic properties show a single ferromagnetic-to-paramagnetic transition at 228 K and a saturation magnetization close to 4.95 mu B/f.u. Three distinct Raman modes at 657, 642, and 511 cm(-1) are observed. The phonon excitations show a clear hardening due to anharmonicity from 300 down to 10 K. Further, the temperature dependence of the 657 cm(-1) mode shows only a small softening. This reflects the presence of a relatively weak spin-phonon coupling in Pr2NiMnO6 contrary to the case for other double perovskites previously studied.

引用

页数：5

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