The low-temperature properties of MFe4P» (M =La, Pr, Nd, arid Th) single crystals have been studied by means of electrical-resistivity, magnetization, specific-heat, and magnetoresistivity measurements. Superconductivity among these compounds is known to occur only in LaFe4P», which has a superconducting transition temperature T, of -4 K. The compounds PrFe4P» and NdFe4P» display features that suggest the occurrence of antiferromagnetic ordering below -6.2 K and ferromagnetic ordering below -2 K, respectively. Isothermal magnetization curves for PrFe4P» below 6 K reveal a spin-flop or metamagnetic transition.
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