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首页> 外文期刊>Physical review >Peculiarities of the superconducting gaps and the electron-boson interaction in TmNi_2B_2C as seen by point-contact spectroscopy
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Peculiarities of the superconducting gaps and the electron-boson interaction in TmNi_2B_2C as seen by point-contact spectroscopy

机译：点接触光谱法观察TmNi_2B_2C中超导间隙的奇异性和电子-玻色子相互作用

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摘要

Point-contact (PC) investigations on the title compound in the normal and superconducting (SC) state (T_c approx= 10.6 K) are presented. The temperature dependence of the SC gap of TmNi_2B_2C determined from Andreev-reflection (AR) spectra using the standard single-gap approximation (SGA) deviates from the BCS behavior in displaying a maximum at about T_c/2. A refined analysis within the two-gap approximation provides evidence for the presence of a second gap twice as large as the main gap (the first one), while the latter is close to that within the SGA. This way, TmNi_2B_2C expands the number of nickel borocarbide superconductors which exhibit a clear multiband character. Additionally, "reentrant" features were found in the AR spectra for some PCs measured in a magnetic field. The PC spectroscopy of the electron-boson interaction in TmNi_2B_2C in the normal state reveals a pronounced phonon maximum at 9.5 meV and a more smeared one at around 15 meV, while at higher energies the PC spectra are almost featureless. Additionally, the most intense peak slightly above 3 meV observed in the PC spectra of TmNi_2B_2C is presumably caused by crystalline-electric-field (CEF) excitations. The peak near 1 meV detected for some PC spectra is connected with a modification of the CEF, probably due to boron or carbon vacancies, allowing a probe of the local stoichiometry by PC spectroscopy.
机译：提出了在正常和超导（SC）状态下（T_c大约= 10.6 K）进行标题化合物的点接触（PC）研究。 TmNi_2B_2C的SC间隙的温度依赖性，通过使用标准单间隙逼近（SGA）从安德列夫反射（AR）光谱确定，偏离了BCS行为，在大约T_c / 2处显示最大值。在两间隙近似中进行的精细分析为存在第二个间隙的证据提供了证据，该第二个间隙是主间隙（第一个间隙）的两倍，而后者接近于SGA中的间隙。这样，TmNi_2B_2C扩展了具有清晰多频带特性的硼碳化镍超导体的数量。此外，在磁场中测量的某些PC的AR光谱中发现了“折返”特征。正常状态下TmNi_2B_2C中电子-玻色子相互作用的PC光谱显示，在9.5 meV处有一个明显的声子最大值，在15 meV处有一个更模糊的声子，而在较高能量下，PC谱几乎没有任何特征。此外，在TmNi_2B_2C的PC光谱中观察到的略高于3 meV的最强峰可能是由晶体电场（CEF）激发引起的。对于某些PC光谱检测到的接近1 meV的峰可能与CEF的变化有关，这可能是由于硼或碳的空位所致，从而允许通过PC光谱学进行局部化学计量的探测。

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  • 来源
    《Physical review》 |2011年第9期|p.094516.1-094516.9|共9页
  • 作者

    Yu. G. Naidyuk; O. E. Kvitnitskaya; L. V. Tiutrina; I. K. Yanson; G. Behr; G. Fuchs; S.-L. Drechsler; K. Nenkov; L. Schultz;

  • 作者单位

    B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin Avenue, 61103, Kharkiv, Ukraine;

    B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin Avenue, 61103, Kharkiv, Ukraine;

    B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin Avenue, 61103, Kharkiv, Ukraine;

    B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin Avenue, 61103, Kharkiv, Ukraine;

    Leibniz-Institut fuer Festkb'rper- und Werkstofffbrschung Dresden e.V, Postfach 270116, D-01171 Dresden, Germany;

    Leibniz-Institut fuer Festkb'rper- und Werkstofffbrschung Dresden e.V, Postfach 270116, D-01171 Dresden, Germany;

    Leibniz-Institut fuer Festkb'rper- und Werkstofffbrschung Dresden e.V, Postfach 270116, D-01171 Dresden, Germany;

    Leibniz-Institut fuer Festkb'rper- und Werkstofffbrschung Dresden e.V, Postfach 270116, D-01171 Dresden, Germany;

    Leibniz-Institut fuer Festkb'rper- und Werkstofffbrschung Dresden e.V, Postfach 270116, D-01171 Dresden, Germany;

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  • 关键词

    metal-to-metal contacts; proximity effects; Andreev effect; SN and SNS junctions; ternary, quaternary and multinary compounds (including Chevrel phases, borocarbides, etc.);

    机译：金属对金属的接触;邻近效应;安德列夫效应;SN和SNS交界处;三元;四元和多元化合物（包括Chevrel相;硼碳化物等）;

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