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Tuning of dielectric properties of SrTiO_3 in the terahertz range

机译:太赫兹范围内SrTiO_3介电性能的调谐

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摘要

Tuning of the dielectric permittivity spectra of strontium titanate (SrTiO_3) single crystals in an external electric field is investigated between 90 and 300 K by means of terahertz time-domain spectroscopy. Application of the electric bias leads to an appreciable tuning of the permittivity observed up to room temperature both in the parallel and perpendicular directions to the bias field. The observed behavior is interpreted in terms of soft-mode hardening due to the anharmonic character of its potential. No additional low-frequency relaxation mode was observed. A weak temperature dependence of the anharmonic coefficients was found in agreement with previously published low-temperature data.
机译:利用太赫兹时域光谱技术研究了钛酸锶(SrTiO_3)单晶在外部电场中的介电常数谱在90至300 K之间的调谐。电偏置的施加导致在与偏置场平行和垂直的方向上观察到的直至室温的介电常数的明显调整。观察到的行为是由于其电位的非谐特性而用软模硬化来解释的。没有观察到额外的低频弛豫模式。发现非谐系数的温度依赖性较弱,这与先前发布的低温数据一致。

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  • 来源
    《Physical review》 |2011年第17期|p.174121.1-174121.10|共10页
  • 作者单位

    Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-182 21 Prague 8, Czech Republic;

    Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-182 21 Prague 8, Czech Republic;

    Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-182 21 Prague 8, Czech Republic;

    Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-182 21 Prague 8, Czech Republic;

    Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-182 21 Prague 8, Czech Republic;

    Institute of Bio and Nanosystems, Research Centre Ju'lich, D-52425 Jiilich, Germany and JARA-Fundamentals of Future Information Technology;

    Department of Chemistry and Biochemistry, University of Munich (LMU), Butenandtstrasse 5-13, D-81377 Munich, Germany;

    Department of Chemistry and Biochemistry, University of Munich (LMU), Butenandtstrasse 5-13, D-81377 Munich, Germany;

    Laboratoire des Sciences des Procedes et des Materiaux (LSPM) (CNRS-UPR 3407), Universite Paris 13, 99 Avenue J.-B. Clement, F-93430 Villetaneuse, France;

    Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-182 21 Prague 8, Czech Republic;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    permittivity (dielectric function);

    机译:介电常数(介电函数);

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