  The Hall effect and its associated anomalies offer an important means for
describing superconducting property in cuprate compounds. Here, we investigate
the electron- and hole-doping effects (implemented through Al- and Ag-doping,
respectively) on the Hall effect and transport properties of Y123
superconducting materials (YBa2Cu3-xXxO7-d; X= Ag, Al). The Hall anomaly, in
both normal and vortex states, generally depends on multiple factors, such as
temperature, magnetic field, and amount/type of doping. Specifically, for our
samples, we observed that hole doping first enhances the critical temperature
TC, whereas its excess beyond a threshold value (here x=0.15) decreases TC;
electron doping, however, decreases TC. We also show how doping changes the
critical current density JC at temperature 77K with magnetic field 9kOe. More
importantly, all of our samples exhibited one Hall sign reversal.
Interestingly, behavior of the Hall coefficient vs. temperature reveals that
the Hall dip vs. magnetic field for Ag - doped samples shows a behavior
opposite to that for Al-doped samples.
