Abstract
The spectral dependence of persistent photoconductivity or photoinduced hole doping effects in oxygen-deficient YBa2Cu3O y (y = 6.35 and 6.45) thin films is investigated for photon energies between 1.0 and 3.1 eV. It is found that the shape of the photoconductivity spectra has little dependence on y. They show a threshold energy of approximately 1.4 eV and a few clear peaks which are similar to those observed in the fundamental absorption spectra of semiconducting YBCO (y < 6.35). The photoconductivity spectra which are normalized by the product of the incident power and the absorption coefficient of the semiconducting films are only slightly dependent on the photon energy. These facts as well as previous results on photoinduced changes in transport properties suggest that charge-transfer excitation in the CuO2 plane causes the oxygen ordering in the CuO x chain plane which in turn causes the hole doping effects.
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Tanabe, K., Kubo, S., Suzuki, M. (1995). Spectral Dependence of Photoinduced Hole Doping Effects in Oxygen-Deficient YBa2Cu3O y . In: Yamafuji, K., Morishita, T. (eds) Advances in Superconductivity VII. Springer, Tokyo. https://doi.org/10.1007/978-4-431-68535-7_40
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DOI: https://doi.org/10.1007/978-4-431-68535-7_40
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