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Direct observation of the superconducting gap in a thin film of titanium nitride using terahertz spectroscopy

机译:使用太赫兹光谱法直接观察氮化钛薄膜中的超导间隙

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摘要

We report on the charge carrier dynamics of superconducting titanium nitride (TiN) in the frequency range 90-510 GHz (3-17 cm~(-1)). The experiments were performed on an 18-nm thick TiN film with a critical temperature of T_c = 3.4 K. Measurements were carried out from room temperature down to 2 K, and in magnetic fields up to B = 7 T. We extract the real and imaginary parts of the complex conductivity σ as a function of frequency and temperature, directly providing the superconducting energy gap 2Δ. Further analysis yields the superconducting London penetration depth λ_L. The findings as well as the normal-state properties strongly suggest conventional BCS superconductivity, underlined by the ratio 2Δ(0)/k_BT_c = 3.44. Detailed analysis of the charge carrier dynamics of the silicon substrate is also discussed.
机译:我们报告了在90-510 GHz(3-17 cm〜(-1))频率范围内的超导氮化钛(TiN)的电荷载流子动力学。实验是在18nm厚的TiN膜上进行的,临界温度为T_c = 3.4K。测量范围是从室温降至2 K,在磁场高达B = 7 T的条件下。电导率σ的虚部随频率和温度而变化,直接提供了超导能隙2Δ。进一步分析得出超导伦敦穿透深度λ_L。这些发现以及正常状态特性强烈暗示了常规的BCS超导性,其比率为2Δ(0)/ k_BT_c = 3.44。还讨论了硅衬底的电荷载流子动力学的详细分析。

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  • 来源
    《Physical review》 |2012年第18期|184503.1-184503.5|共5页
  • 作者单位

    I. Physikalisches Institut, University of Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany;

    I. Physikalisches Institut, University of Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany;

    I. Physikalisches Institut, University of Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany;

    Institute of Experimental and Applied Physics, University of Regensburg, 93025 Regensburg, Germany;

    Institute of Experimental and Applied Physics, University of Regensburg, 93025 Regensburg, Germany;

    A. V. Rzhanov Institute of Semiconductor Physics SB RAS, 13 Lavrentjev Avenue, Novosibirsk 630090, Russia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    superconducting films and low-dimensional structures; optical properties;

    机译:超导膜和低维结构;光学性质;

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