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首页> 外文期刊>Journal of Experimental and Theoretical Physics >The Dielectric Response of Quantum Paraelectrics Containing Dipole Impurities
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The Dielectric Response of Quantum Paraelectrics Containing Dipole Impurities

机译：包含偶极子杂质的量子顺电介质的介电响应

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摘要

The presence of even a very small concentration of slowly reoriented dipole impurities in a quantum paraelectric leads to strong changes in the dielectric response of the sample. This is manifested by the appearance of a giant dielectric susceptibility, colossal frequency dispersion, and several peaks in the temperature dependence of the susceptibility; in addition, the temperature dependence of the relaxation time deviates from exponential. The experimental results are presented for KTaO_3 samples slightly or moderately doped with lithium. General relationships between the dielectric response and the concentration of impurities, the temperature, and the frequency are established. A theory is proposed which qualitatively explains the observed complex phenomena and sometimes quantitatively describes the results with high precision.
机译：量子顺电中甚至很小浓度的缓慢重新取向的偶极子杂质的存在也会导致样品介电响应的强烈变化。这表现为巨大的介电敏感性，巨大的频率色散以及对敏感性的温度依赖性的几个峰值。另外，弛豫时间的温度依赖性与指数有偏差。给出了略微或中等掺杂锂的KTaO_3样品的实验结果。建立了介电响应与杂质浓度，温度和频率之间的一般关系。提出了一种定性解释观察到的复杂现象并有时以高精度定量描述结果的理论。

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