Infrared synchrotron-radiation transmission measurements on YBa2Cu3O7- in the gap and supercurrent regions

G. P. Williams, R. C. Budhani, C. J. Hirschmugl, G. L. Carr, S. Perkowitz, B. Lou, T. R. Yang

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We report infrared synchrotron-radiation transmission measurements on 1-m-thick films of high-Tc YBa2Cu3O7- from 40 to 290 cm-1 (5 to 36 meV). The films were deposited onto MgO substrates and showed resistive superconducting transitions with an onset at 83 K. Spectra below Tc show superconducting behavior, including the characteristic 1/ supercurrent dependence for frequencies below 100 cm-1. The entire spectrum can be fit when a Mattis-Bardeen-type conductivity is included identifying increasing absorption beginning at a photon energy of 23 meV. However, a substantial residual absorption persists to the lowest measured frequencies. In addition, the appearance of phonons, some attributable to c-axis vibrations, suggests we are sampling a mixture of both a-bplane and c-axis properties.

Original languageEnglish
Pages (from-to)4752-4755
Number of pages4
JournalPhysical Review B
Issue number7
Publication statusPublished - 1990 Jan 1


ASJC Scopus subject areas

  • Condensed Matter Physics

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