Theory-guided investigation on magnetic evolution of MnPt${}_{5-x}$Pd${}_x$P and discovery of anti-CeCoIn${}_5$-type ferromagnetic MnPd${}_5$P

Abstract

We report the magnetic changes from canted antiferromagnetic to ferromagnetic orderings in anti-115-type MnPt${}_{5-x}$Pd${}_x$P ($x$ = 1, 2, 2.5, 3, 4, and 5) and the discovery of a new rare-earth-free ferromagnet, MnPd${}_5$P by both theoretical prediction and experimental investigation. The family compounds were synthesized using high temperature solid state method and characterized to crystalize in the anti-CeCoIn${}_5$ type with the space group P4/mmm exhibiting a two-dimensional layered structural feature. The magnetic property measurements indicate that the compounds ordered from canted A-type antiferromagnet in MnPt${}_5$P to ferromagnet above the room temperature with varying degrees of coercivity and magnetic moments in MnPd${}_5$P by reducing the spin orbital coupling. The results of the MnPt${}_{5-x}$Pd${}_x$P have been analyzed in comparison to the other candidates of the 151 family of Mn(Pt/Pd)${}_5$(P/As) to understand the complex structure-magnetism relationships.