New High-Field Ordered State in PrFe₄P₁₂

Abstract

Dc magnetization and specific heat measurements on the filled skutterudite PrFe 4 P 12 reveal the presence of a new ordered state (B phase) in high magnetic fields applied along the [111] direction. The present data suggest that the B phase exists in a limited angular range around the [111] direction. A possible origin of the B phase is discussed within the framework of the Γ 1 –Γ 4 model.