Transport properties of the heavy fermion superconductor PrOs₄Sb₁₂

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We have measured the electrical resistivity, thermoelectric power, Hall coefficient, and magnetoresistance (MR) on single crystals of PrOs₄Sb₁₂, LaOs₄Sb₁₂ and NdOs₄Sb₁₂. All the transport properties in PrOs₄Sb₁₂ are similar to those in LaOs₄Sb₁₂ and NdOs₄Sb₁₂ at high temperatures, indicating the localized character of 4f-electrons. The transverse MR both in LaOs₄Sb₁₂ and PrOs₄Sb₁₂ tends to saturate for wide field directions, indicating these compounds to be uncompensated metals with no open orbit. We have determined the phase diagram of the field induced ordered phase by the MR measurement for all the principle field directions, which indicates an unambiguous evidence for the Γ 1 singlet crystalline electric field ground state.