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Observation of plasmon-phonons in a metamaterial superconductor using inelastic neutron scattering (Conference Presentation)

Paper 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.

Paper Details

Date Published: 9 September 2019
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Proc. SPIE 11080, Metamaterials, Metadevices, and Metasystems 2019, 110801B (9 September 2019); doi: 10.1117/12.2530099
Show Author Affiliations
Igor I. Smolyaninov, Univ. of Maryland, College Park (United States)
Vera Smolyaninova, Towson Univ. (United States)
Jeffrey Lynn, National Institute of Standards and Technology (United States)
Nicholas Butch, National Institute of Standards and Technology (United States)
Heather Chen-Mayer, National Institute of Standards and Technology (United States)
Joseph Prestigiacomo, U.S. Naval Research Lab. (United States)
Mike Osofsky, U.S. Naval Research Lab. (United States)


Published in SPIE Proceedings Vol. 11080:
Metamaterials, Metadevices, and Metasystems 2019
Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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