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Polarized Reflectivity And Lattice Dynamics Calculation Of Multiferroic Ymno_3

机译:多铁性Ymno_3的偏振反射率和晶格动力学计算

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摘要

Temperature-dependent reflectivity spectra of a multiferroic hexagonal YMnO_3, single crystal were measured with polarized light in the ferroelectric phase. The phonon parameters for both E‖c and E⊥c polarizations are obtained by fitting the dielectric function to experimental data. Phonon assignment is done on the basis of lattice dynamics calculations. Phonon anomalies are found at the antiferromagnetic transition T_N. Mean Born effective charges are calculated from phonon fit parameters and discussed in the framework of the different mechanisms proposed for the origin of ferroelectricity in hexagonal multiferroic manganites.
机译:用铁电相中的偏振光测量了多铁六角形YMnO_3单晶的随温度变化的反射光谱。 E'c和E toc极化的声子参数是通过将介电函数拟合到实验数据而获得的。声子分配是基于晶格动力学计算完成的。在反铁磁跃迁T_N处发现了声子异常。从声子拟合参数计算出平均出生有效电荷,并在为六方多铁锰铁矿中铁电起源提出的不同机制的框架中进行了讨论。

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