Abstract

The temperature–frequency spectra of the complex dielectric permittivity of the LuFe₂O₄ multiferroics have been studied in the temperature range 100–400 K at frequencies 20 Hz–120 MHz. It is found that the temperature coefficient of the dielectric permittivity changes its sign and the ac conductivity has maxima and minima in the temperature range ~150–350 K and in the frequency range ~30–120 MHz. These specific features are due to independent resonance mechanisms: the coincidence of frequency of the measuring ac voltage with the frequency of electron jumps as the hopping conductivity takes place; the proximity of the measurement signal period to the time of formation of a barrier layer at the boundary of contact with the sample; and the approximation of the frequency of an ac external field to the frequency of the sample structural elements.

中文翻译：

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LuFe 2 O 4多铁中介电响应的温度-频率依赖性

摘要

LuFe ₂ O ₄的复介电常数的温度-频谱在100 Hz至400 K的温度范围内，频率为20 Hz至120 MHz的情况下，对多铁性材料进行了研究。发现介电常数的温度系数改变其符号，并且交流电导率在〜150–350 K的温度范围和〜30–120 MHz的频率范围内具有最大值和最小值。这些特定的特征是由于独立的共振机制引起的：交流电压的测量频率与电子的频率随跳跃电导率的变化而一致；测量信号周期与在与样品接触的边界处形成阻挡层的时间的接近度；交流外部磁场的频率与样本结构元件的频率的近似值。