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

TL;DR

This study combines theoretical and experimental methods to explore magnetic phase transitions in MnPt$_{5-x}$Pd$_x$P compounds, discovering a new ferromagnetic material MnPd$_5$P with potential applications.

Contribution

It provides a comprehensive analysis of magnetic evolution in MnPt$_{5-x}$Pd$_x$P and reports the discovery of a new rare-earth-free ferromagnet, MnPd$_5$P.

Findings

Transition from canted antiferromagnetic to ferromagnetic order with Pd doping.

MnPd$_5$P exhibits ferromagnetism above room temperature.

Structural analysis confirms anti-CeCoIn$_5$-type layered structure.

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.