Phonon thermal transport and phonon-magnon coupling in polycrystalline BiFeO3 systems

被引：15

作者：

Ramachandran, B. ^{[1
]}

Wu, K. K. ^{[1
]}

Kuo, Y. K. ^{[1
]}

Rao, M. S. Ramachandra ^{[2
,3
]}

机构：

[1] Natl Dong Hwa Univ, Dept Phys, Hualien 97401, Taiwan

[2] Indian Inst Technol, Dept Phys, Nano Funct Mat Technol Ctr, Chennai 600036, Tamil Nadu, India

[3] Indian Inst Technol, Mat Sci Res Ctr, Chennai 600036, Tamil Nadu, India

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2015年 / 48卷 / 11期

关键词：

multiferroics; phonon thermal transport; phonon-magnon coupling;

D O I：

10.1088/0022-3727/48/11/115301

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Temperature-dependent thermal conductivity of polycrystalline BiFeO3, Bi0.9Ba0.05Ca0.05 FeO2.95 and Bi0.9Ca0.1FeO2.95 materials was measured using a direct heat pulse technique. Thermal conductivity of the BiFeO3-based materials is analyzed using a phonon model to probe the thermal transport mechanisms in these ferrites. It is found that the calculated thermal conductivity of the BiFeO3-based compounds is in good agreement with experimental data. The suppression of the low-temperature phonon peak in the thermal conductivity of the doped BiFeO3 materials is mainly attributed to the phonon-point-defect scattering. In addition, the contribution of optical phonon-magnon resonance scattering to optical phonon thermal transport reveals the presence of phonon-magnon coupling in these BiFeO3 materials. Finally, magneto-thermal conductivity measurements show the magnon thermal transport in pure and doped BiFeO3 systems.

引用

页数：7

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