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The Hall effect and its associated anomalies offer an important means fordescribing superconducting property in cuprate compounds. Here, we investigatethe electron- and hole-doping effects (implemented through Al- and Ag-doping,respectively) on the Hall effect and transport properties of Y123superconducting materials (YBa2Cu3-xXxO7-d; X= Ag, Al). The Hall anomaly, inboth normal and vortex states, generally depends on multiple factors, such astemperature, magnetic field, and amount/type of doping. Specifically, for oursamples, we observed that hole doping first enhances the critical temperatureTC, whereas its excess beyond a threshold value (here x=0.15) decreases TC;electron doping, however, decreases TC. We also show how doping changes thecritical current density JC at temperature 77K with magnetic field 9kOe. Moreimportantly, all of our samples exhibited one Hall sign reversal.Interestingly, behavior of the Hall coefficient vs. temperature reveals thatthe Hall dip vs. magnetic field for Ag - doped samples shows a behavioropposite to that for Al-doped samples.

Substitution effects of Ag/Cu and Al/Cu on Y123 samples: Hall anomaly and transport properties