Magnetic ordering in PrFe 4As 12

Abstract

Magnetization M( H, T), specific heat C( T), and electrical resistivity ρ( T), measurements were performed on single crystals of the Pr-based filled skutterudite compound PrFe 4As 12. M( H) isotherms indicate a saturation magnetization of 2.3 μ B/f.u., and Arrott analysis reveals a Curie temperature T C=18.2 K and saturated moment M sat=2.0 μ B/f.u. Curie–Weiss analysis of magnetic susceptibility, χ, reveals two distinct regions: for T>100 K, the effective moment μ eff=3.98 μ B and the Curie–Weiss temperature θ CW=4.1 K, while for 19.5< T<75 K, μ eff=3.52 μ B and θ CW=17.7 K. C( T) and ρ( T) show distinct features at T C, while the ac susceptibility exhibits lower temperature features, possibly associated with changes in magnetic structure.