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Magnetic susceptibility, phonons and dielectric constant of single crystalline BiFeO3

handsomeland 添加于 2009-7-20 02:12 | 3521 次阅读 | 3 个评论

作者
Lu J, Schmidt M, Lunkenheimer P, Pimenov A, Mukhin AA, Travkin VD, Loidl A
摘要
The magnetic susceptibility between 1.5 and 800 K, the infrared reflectivity at room temperature and the temperature dependence of the dielectric constant at mm-wavelengths are reported for single crystalline BiFeO3. A well developed anomaly in the magnetic susceptibility signals the onset of antiferromagnetic order close to 640 K. Beside this anomaly, no further indications of phase or spin-glass transitions are found in the susceptibility down to the lowest temperatures. From infrared reflectivity we were able to identify all 9 phonon modes which are expected to be infrared active within the ab plane of the crystal. The temperature dependence of the dielectric constant was measured contact free in the 100 GHz range yielding e' = 54 at room temperature. The loss is substantial and strongly frequency dependent indicating the predominance of hopping conductivity.
详细资料
- 关键词: cond-mat.str-el; cond-mat.mtrl-sci
- 文献种类:期刊
- 备注:arXiv:0906.2867v2; 3 figures, 1 table and 22 references. Submission for International Conference on Magnetism (ICM) 2009 in Karlsruhe - Germany with the poster session No. Tu-D-1.11-35
标签

BiFeO3 BiFeO3 single crystal BiFeO3 phonons BiFeO3 magnetism BiFeO3 phase transitions BiFeO3 dielectric BiFeO3 conductivity BiFeO3 china
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放篇自己的arXiv试一下，

这篇工作从实验角度使用质量非常高的BiFeO3单晶揭示

1、在Tn以下没有所谓的spin-glass转变，前人可能因为材料质量不好犯了mistake。

2、同时利用红外声子和太赫兹测量得到BiFeO3的本征介电常数。

New! ！和这篇会议透露的部分结果相关的BFO单晶详尽的结果(结构、比热、磁性、铁电性、宽温宽频介电常数和电导率等)2009.10.02刚刚传到arXiv，并最终发表在EPJB： http://dx.doi.org/10.1140/epjb/e2010-00170-x

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