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We report the magnetic, electronic and transport properties of thequasi-skutterudite compound Pr$_3$Ir$_4$Ge$_{13}$ by means of magneticsusceptibility $\chi(T)$, electrical resistivity $\rho(T)$, specific heat$C_p(T)$, thermal conductivity $\kappa(T)$, thermoelectric power $S(T)$ andHall coefficient $R_\mathrm{H}(T)$ measurements. Pr$_3$Ir$_4$Ge$_{13}$ does notshow any phase transition down to 1.9 K. Magnetic, and specific measurementsshow that the system possesses a crystal electric field singlet ground statethat is separated from the first excited state by about 37 K. $\rho(T)$ shows anegative temperature coefficient of resistance for the whole temperature rangestudied and which can be explained in terms of Mott's impurity band conductionmechanism. $R_\mathrm{H}(T)$ measurements show that Pr$_3$Ir$_4$Ge$_{13}$ is alow-carrier density semimetal and its transport properties indicate ametallic-non metallic cross over behaviour. Large Seebeck values were observedfor the entire temperature range of investigation, and the analysis oftemperature variation of $S$ and $S/T$ showed no sign of strong correlationbetween the Pr 4$f^2$ and conduction electron states near Fermi level. A largeSommerfeld coefficient, $\gamma = 150$~mJ/(mol K$^2$) indicates the formationof a moderate heavy-fermion state emerging from the dynamical crystal fieldfluctuations.

Nonmagnetic ground state, Crystal field effects and Heavy-fermion behaviour in the Remeika Phase: Pr$_3$Ir$_4$Ge$_{13}$