Observation of plasmon-phonons in a metamaterial superconductor using inelastic neutron scattering
Vera N. Smolyaninova, Jeffrey W. Lynn, Nicholas P. Butch, Heather Chen-Mayer, Joseph C. Prestigiacomo, M. S. Osofsky, Igor I. Smolyaninov
DOI 10.1103/PhysRevB.100.024515 · Physical Review B
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Abstract
A metamaterial approach is capable of drastically increasing the critical temperature, Tc, 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure not reported | onset |
| Al-Al2O3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.7 | Pressure not reported | onset |
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