Abstract
The effectiveness of different ways to introduce holes into the CuO2 planes was compared in the Cu(Ba0.8Sr0. 2)2(Yb1-xCax)Cu2O6+z (Cu-1212) system in the wide substitution ranges of 0 ≤ x ≤ 0.4 and 0 ≤ z ≤ 0.9, both in respect to the capability to increase T c and in terms of the hole production as estimated from neutron diffraction data via bond-valence calculation. Oxygen doping was found to increase the hole concentration less efficiently, and further, at a certain hole concentration value higher T c values were obtained with calcium doping. The two different doping ways exhibited also different T c - versus- Cu-O bond length relations. As a conclusion, the possible role of the hole distribution in the in-plane Cu-O bond in determining the superconducting properties was recognized.
Published Version
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