ISSN:
1063-7834
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1134/1.1131295
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