Abstract
The parameters of the crystal electric-field gradient at the copper sites of Tl2Ba2CuO6 and Tl2Ba2CaCu2O8 have been determined by Mossbauer emission spectroscopy using the 67Cu(67Zn) isotope, and calculated in the point-charge approximation. The results obtained are analyzed using the available 63Cu nuclear quadrupole resonance data. The experimental and calculated data can be brought in agreement if one assumes that the holes appearing after part of the thallium atoms lower their valency become localized primarily at the oxygen sites lying in the plane of the copper ions.
Published Version
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