Superconductivity in LaPd$_{1-x}$Bi$_{2}$ and moderate heavy fermion behavior in antiferromagnetic CePd$_{1-x}$Bi$_{2}$

Superconductivity at 2.1 K is observed in LaPd$_{1-x}$Bi$_{2}$. A small residual resistance ratio indicates a strong scattering effect induced by Pd vacancies. Hall effect measurements reveal electron-like carriers and single-band transport behavior in LaPd$_{1-x}$Bi$_{2}$. Band structure calculations support the possibility of Fermi surface nesting near the fully stoichiometric case in LaPd$_{1-x}$Bi$_{2}$. By creating Pd vacancies the Fermi surface nesting is avoided which suppresses any potential CDW on the Bi net. CePd$_{1-x}$Bi$_{2}$ is non-superconducting but shows antiferromagnetic ordering below 6 K. A Sommerfeld coefficient of 0.199 J.molCe$^{-1}$K$^{-2}$ reveals a moderate heavy fermion behavior in CePd$_{1-x}$Bi$_{2}$. The resistivity curve shows the presence of Kondo and crystalline-electric-field effects. Magnetoresistance and Hall effect measurements show the interplay between Kondo and crystalline-electric-field effects obviously reconstructs the Fermi surface topology of CePd$_{1-x}$Bi$_{2}$ around 75 K. With the help of band structure calculations, we argue the f-d hybridization in CePd$_{1-x}$Bi$_{2}$ quenches the superconductivity.