Observation of plasmon-phonons in a metamaterial superconductor using inelastic neutron scattering
| Autor: | Igor I. Smolyaninov, Vera N. Smolyaninova, Jeffrey W. Lynn, H. Heather Chen-Mayer, Joseph Prestigiacomo, Michael Osofsky, Nicholas P. Butch |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Superconductivity Condensed matter physics Phonon Condensed Matter - Superconductivity Metamaterial Physics::Optics FOS: Physical sciences Inelastic neutron scattering Superconductivity (cond-mat.supr-con) Condensed Matter::Materials Science Pairing Condensed Matter::Superconductivity Plasmon Excitation Physics - Optics Optics (physics.optics) |
| DOI: | 10.48550/arxiv.1809.02715 |
| Popis: | 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. Comment: 25 pages, 6 figures, this version is accepted for publication in Phys.Rev.B |
| Databáze: | OpenAIRE |
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