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Observation of plasmon-phonons in a metamaterial superconductor using inelastic neutron scattering

机译:利用非弹性中子散射观察超材料超导体中的等离激元声子

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摘要

A metamaterial approach is capable of drastically increasing the critical temperature, T-c, of composite metal-dielectric superconductors as demonstrated by the tripling of Tc that was observed in bulk Al-Al2O3 core-shell metamaterials. A theoretical model based on the Maxwell-Garnett approximation provides a microscopic explanation of this effect in terms of electron-electron pairing mediated by a hybrid plasmon-phonon excitation. We report an observation of this excitation in Al-Al2O3 core-shell metamaterials using inelastic neutron scattering. This result provides support for this mechanism of superconductivity in metamaterials.
机译:超材料方法能够极大地提高复合金属-电介质超导体的临界温度T-c,这是通过在本体Al-Al2O3核-壳超材料中观察到的Tc的三倍证明的。基于麦克斯韦-加纳特(Maxwell-Garnett)近似的理论模型以混合等离子体激元-声子激发介导的电子-电子配对的形式提供了这种效应的微观解释。我们报告使用非弹性中子散射在Al-Al2O3核壳超材料中激发的观察结果。这一结果为超材料中的超导机理提供了支持。

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  • 来源
    《Physical review》 |2019年第2期|024515.1-024515.7|共7页
  • 作者单位

    Towson Univ, Dept Phys Astron & Geosci, 8000 York Rd, Towson, MD 21252 USA;

    NIST, Ctr Neutron Res, 100 Bur Dr, Gaithersburg, MD 20899 USA;

    NIST, Ctr Neutron Res, 100 Bur Dr, Gaithersburg, MD 20899 USA;

    NIST, Ctr Neutron Res, 100 Bur Dr, Gaithersburg, MD 20899 USA;

    Naval Res Lab, Washington, DC 20375 USA;

    Naval Res Lab, Washington, DC 20375 USA;

    Univ Maryland, Dept Elect & Comp Engn, College Pk, MD 20742 USA|Saltenna LLC, 1751 Pinnacle Dr 600, Mclean, VA 22102 USA;

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