Effect of Cu/Zn Substitution upon Superconductivity in YBa2(Cu1-xZnx)3O7-δ and La1.85Sr0.15Cu1-xZnxO4-δ
The phenomenon of high-Tc superconductivity in the two families of ceramic Cu-oxides (LaBaCuO1, YBaCuO2) generated a wide spectrum of theoretical models which indicate that experimental data of these materials are of grime interest. According to recent bandstructure calculations3,4 the main contribution to the density of states at the Fermi energy comes from the antibonding combinations of the Cu-dx2-y2 -orbitals with the px- and py-orbitals of the neighbouring Oatoms. Therefore we substituted Cu by Zn whose ionic size and orbital structure is close to Cu and present results on the structural chemistry, electrical resistivity and heat capacity of well characterized samples.
KeywordsElectrical Resistivity Unit Cell Dimension Preferential Occupation Heavy Fermion System Valence Electron Concentration
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