Optical properties and electronic structure of multiferroic hexagonal orthoferrites RFeO3 (R = Ho, Er, Lu)
Optical properties and electronic structure of multiferroic hexagonal orthoferrites RFeO3 (R = Ho, Er, Lu)
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多铁性六方正铁氧体RFeO3（R = Ho、Er、Lu）的光学性质和电子结构
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发表时间：
2011
期刊：
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通讯作者：
R. Pisarev
中科院分区：
文献类型：
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作者：
V. Pavlov;A. Akbashev;A. Kalashnikova;V. Rusakov;A. Kaul;M. Bayer;R. Pisarev
本文报道了多铁性六方晶系（P.G.）薄膜的光学性质。在ZrO_2（Y_2 O_3）衬底的（111）面上外延生长了稀土正铁氧体RFeO_3（R = Ho，Er，Lu）。在0.6-5.6 eV范围内的光吸收研究表明，薄膜是透明的低于1.9 eV，高于此能量四个广泛的强吸收带被区分。考虑到不寻常的五倍协调的Fe 3+离子的吸收光谱进行了分析。在4.9 eV处的光吸收的温度依赖性在124 K处显示出异常，我们将其归因于铁亚晶格的磁有序。
We report on optical studies of the thin films of multiferroic hexagonal (P.G. 6mm) rare-earth orthoferrites RFeO3 (R = Ho, Er, Lu) grown epitaxially on a (111)-surface of ZrO2(Y2O3) substrate. The optical absorption study in the range of 0.6–5.6 eV shows that the films are transparent below 1.9 eV; above this energy four broad intense absorption bands are distinguished. The absorption spectra are analyzed taking into account the unusual fivefold coordination of the Fe3+ ion. Temperature dependence of the optical absorption at 4.9 eV shows anomaly at 124 K, which we attribute to magnetic ordering of iron sublattices.