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首页> 外文期刊>Journal of Applied Physics >Giant dielectric response of Haldane gap compound Y_(2)BaNiO_(5)
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Giant dielectric response of Haldane gap compound Y_(2)BaNiO_(5)

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摘要

The dielectric properties of the Haldane gap compound Y_(2)BaNiO_(5) were studied in the frequency range from 20 Hz to 1 MHz between 20 K and room temperature. This compound exhibits a high dielectric permittivity (epsilon' approx 10~(4)) at room temperature below 100 kHz. Both dielectric relaxation and dc resistivity p follow the thermally activated process with similar value of the activation energy. This indicates the close correlation between the electric conduction and the dielectric polarization. The modulus spectra reveal evidence for both grain and grain boundary relaxation times. The grain relaxation time follows thermally activated process, whereas the grain boundary relaxation time exhibits variable range hopping (VRH) behavior. The observed giant dielectric response were explained in terms of internal (grain boundary) barrier layer capacitance (IBLC) effects.

著录项

  • 来源
    《Journal of Applied Physics》 |2012年第6期|064111-1-064111-4|共4页
  • 作者单位

    Department of Physics, National Taiwan University, Taipei, Taiwan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类 应用物理学;
  • 关键词

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