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9 September 2019 Observation of plasmon-phonons in a metamaterial superconductor using inelastic neutron scattering (Conference Presentation)
Igor I. Smolyaninov, Vera Smolyaninova, Jeffrey Lynn, Nicholas Butch, Heather Chen-Mayer, Joseph Prestigiacomo, Mike Osofsky
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Proceedings Volume 11080, Metamaterials, Metadevices, and Metasystems 2019; 110801B (2019) https://doi.org/10.1117/12.2530099
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States
Abstract
Metamaterial approach is capable of drastically increasing the critical temperature, Tc, of composite metal-dielectric superconductors. Tripling of Tc 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 the first observation of this excitation in Al-Al2O3 core-shell metamaterials using inelastic neutron scattering. This result provides support for this novel mechanism of superconductivity in metamaterials and explains the 50 year old mystery of enhanced Tc in granular aluminium films.
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Igor I. Smolyaninov, Vera Smolyaninova, Jeffrey Lynn, Nicholas Butch, Heather Chen-Mayer, Joseph Prestigiacomo, and Mike Osofsky "Observation of plasmon-phonons in a metamaterial superconductor using inelastic neutron scattering (Conference Presentation)", Proc. SPIE 11080, Metamaterials, Metadevices, and Metasystems 2019, 110801B (9 September 2019); https://doi.org/10.1117/12.2530099
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KEYWORDS
Metamaterials
Scattering
Superconductors
Technetium
Aluminum
Composites
Superconductivity
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