Observation of below-gap plasmon excitations in superconducting YBa2Cu3O7 films

F. J. Dunmore; D. Z. Liu; H. D. Drew; S. Das Sarma; Qi Li; D. B. Fenner

doi:10.1103/PhysRevB.52.R731

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Observation of below-gap plasmon excitations in superconducting YBa2Cu3O7 films

F. J. Dunmore, D. Z. Liu, H. D. Drew, S. Das Sarma, Qi Li, D. B. Fenner

DOI 10.1103/PhysRevB.52.R731 · Physical Review B

T1

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Abstract

Finite-wave-vector collective plasmon resonances have been observed in far-infrared transmission measurements on superconducting YBa2Cu3O7 films. An Al grating is used to couple IR radiation to collective two-dimensional plasma modes. The plasmon dispersion, measured by using different grating periods, spans the frequency range of the energy gap. The strengths of the plasma resonances weaken as the temperature approaches Tc from below. The results are analyzed using a grating coupler theory that includes the hybridization of the plasmons with the diffraction modes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	88	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	75	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown