Abstract
The effect of the partial substitution of Cu for Al on the structural, compositional, and magnetic properties of polycrystalline compounds YBa2Cu3O7−δ was studied. All prepared samples turned out to be single-phase with a small fraction of Ba secondary phases. Substitution of more than 2% aluminum causes an increase in spurious phases. DC susceptibility measurements show that the superconducting transition temperature T C decreases. Hysteresis loops show that magnetic irreversibility decreases with increasing Al content. The critical current density J C obtained using the Bean formula does not follow the same change. Al compensates for a decrease in J C and an increase in its content near the solubility limit gives a higher J C than in an undissolved sample.
Highlights
The analysis of impurity effects in high-temperature superconductors (HTSCs) aroused additional interest after confirming that this subject can serve as a critical test for the D-wave symmetry of the order parameter in high-temperature copper oxides [1, 2]
We report on the study of the effect of partial substitution of Cu for Al and double substitution of Al instead of Cu on the structural and magnetic properties of YBa2Cu3O7 − δ compounds
Their proportion increases with increasing Al content
Summary
The analysis of impurity effects in high-temperature superconductors (HTSCs) aroused additional interest after confirming that this subject can serve as a critical test for the D-wave symmetry of the order parameter in high-temperature copper oxides [1, 2]. It is known that the temperature of the superconducting transition TC depends both on the concentration of holes in the CuO2 planes and on the relative electric charge of oxygen in these planes [3]. We report on the study of the effect of partial substitution of Cu for Al and double substitution of Al instead of Cu on the structural and magnetic properties of YBa2Cu3O7 − δ compounds.
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