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

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)R731-R734
JournalPhysical Review B
Issue number2
StatePublished - 1995

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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