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Luminescence spectra and crystal structure of high-temperature superconductors

  • Metals and Superconductors
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Abstract

A study is reported of the effect of temperature (4.2 K≤T≤150 K), the content of weakly bonded oxygen [6.1≤(7−δ)≤6.9], illumination [E exc=3.4 eV, (Φt)max∼1.5 ×1020 photon cm−2, and substitution (Cu → Ag, Cr, Fe, Mn) on the luminescence spectra of the high-T c superconductor YBa2Cu3O7−δ. Only two bands with E lum∼2.4 and ∼2.8 eV were observed in the luminescence spectra in all these cases. A clearly pronounced correlation between the electronic and structural changes in YBa2Cu3O7−δ, caused by the influence of temperature, illumination, doping with oxygen or metal ions, and the spectral parameters (peak position E lum, width Δλ lum, and intensity I lum of the luminescence bands), has been established. It is shown that luminescence spectra of HTSCs can be employed as a fairly reliable optical probe to study the electronic processes occurring in these substances, in particular, the electron (hole) transfer between the CuO2 plane and the CuO1−δ chain plane serving as a charge reservoir.

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Authors and Affiliations

  1. Verkin Institute for Low Temperature Physics and Engineering, Academy of Sciences of Ukraine, Kharkov, 310164, Ukraine

    V. V. Eremenko, T. V. Sukhareva & V. N. Samovarov

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  1. V. V. Eremenko
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  2. T. V. Sukhareva
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  3. V. N. Samovarov
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__________

Translated from Fizika Tverdogo Tela, Vol. 42, No. 5, 2000, pp. 797–804.

Original Russian Text Copyright © 2000 by Eremenko, Sukhareva, Samovarov.

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Eremenko, V.V., Sukhareva, T.V. & Samovarov, V.N. Luminescence spectra and crystal structure of high-temperature superconductors. Phys. Solid State 42, 816–823 (2000). https://doi.org/10.1134/1.1131295

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