Abstract
We report the magnetic, electronic and transport properties of the quasi-skutterudite compound Pr3Ir4Ge13 by means of magnetic susceptibility χ(T), electrical resistivity ρ(T), specific heat Cp(T), thermal conductivity κ(T), thermoelectric power S(T) and Hall coefficient RH(T) measurements. Pr3Ir4Ge13 does not show any phase transition down to 1.9 K. Magnetic, and specific measurements show that the system possesses a crystal electric field singlet ground state that is separated from the first excited state by about 37 K. ρ(T) shows a negative temperature coefficient of resistance for the whole temperature range studied and which can be explained in terms of Mott’s impurity band conduction mechanism. RH(T) measurements show that Pr3Ir4Ge13 is a low-carrier density semiconductor and its transport properties indicate a metallic-non metallic cross over behaviour. Large Seebeck coefficient was observed for the entire temperature range of investigation, and the analysis of temperature variation of S and S∕T showed no sign of strong correlation between the Pr 4f2 and conduction electron states near Fermi level.
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