Anomalous photoemission threshold in high-T c oxide superconductor with Cs and K submonolayers |
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Authors: | G. V. Benemanskaya M. N. Lapushkin V. S. Vikhnin |
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Affiliation: | 1. A. F. Ioffe Physicotechnical Institute, Politekhnicheskaya 26, 194021, St. Petersburg, Russia
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Abstract: | The photoemission threshold and photocurrent spectra were investigated for Bi2Sr2CaCu2O8 crystals with K or Cs submonolayer films. The different films of K or Cs were deposited on the Bi-O surface in the temperature range 80–250 K. We observed an appreciable (up to 0.3 eV) energy shift of the threshold and a strong modification of the photocurrent spectra for different temperatures and submonolayer coverages. The appropriate model of such a phenomena is based on a quasimetallic K or Cs clusters effect and additional 2D-polaronic effect. |
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