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The Y1-xLixBa2Cu3O7-d polycrystalline bulk superconductors doped with Lisubstituting at the Y site at different concentrations (x = 0, 0.01, 0.02, 0.1)were prepared using the citrate-gel method to study the effects of doping onthe superconducting temperature and critical current density. The question waswhether Li addition characterized by a high Debye frequency would have anypositive effects on Tc. The optimum citrate-gel and heat treatment conditionswere identified as those yielding samples with a maximum grain size on theorder of 50 micro.m (up to the optimum Li-doping level, x=0.01). Lisubstitution at the Y site was verified by structural, electrical, and magneticmeasurements of the produced samples, whereas X-ray diffraction (XRD) analysisrevealed the formation of a pure phase with no visible impurity phases.Moreover, AC magnetic susceptibility measurements showed no increase in thesuperconducting transition temperature Tc, consistent with the predictedresults obtained by machine learning method, although it was theoreticallyexpected to increase owing to the high Debye frequency of Li. This observationis consistent with magnetic coupling models for pairing mechanism in cuprates.Finally, because of the optimum conditions of the preparation procedure, nearlyidentical values of the critical current density (Jc) were recorded for sampleswith different Li doping levels (up to the optimum Li doping level). It wasfound that improved compound preparation conditions would have a critical andextensive effect on Jc enhancement, with nearly no Tc suppression.

Effects of Li Doping on Superconducting Properties of Citrate Gel Prepared Y1-xLixBa2Cu3O7-d Compound