A Magnetic Transition Probed by the Ce Ion in Square-Lattice Antiferromagnet CeMnAsO

TL;DR

This study investigates a magnetic phase transition in CeMnAsO, revealing how Ce ions serve as probes for Mn spin magnetism and uncovering a reorientation of Mn moments at low temperatures.

Contribution

It demonstrates that Ce ions can effectively probe magnetic transitions and reorientations in square-lattice antiferromagnets, highlighting a transition at 34.1 K with implications for geometrical frustration.

Findings

First-order phase transition at 34.1 K observed.

Ce ion ground-state doublet splits by 3.53 meV.

Ce moments are parasitically induced without long-range order.

Abstract

We examined the magnetic properties of the square-lattice antiferromagnets CeMnAsO and LaMnAsO and their solid solutions La1-xCexMnAsO by resistivity, magnetic susceptibility, and heat capacity measurements below room temperature. A first-order phase transition is observed at 34.1 K, below which the ground-state doublet of the Ce ion splits by 3.53 meV. It is likely that Mn moments already ordered above room temperature are reoriented at the transition, as reported for related compounds, such as NdMnAsO and PrMnSbO. This transition generates a large internal magnetic field at the Ce site in spite of the fact that simple Heisenberg interactions should be cancelled out at the Ce site owing to geometrical frustration. The transition takes place at nearly the same temperature with the substitution of La for Ce up to 90%. The Ce moment does not undergo long-range order by itself, but is parasitically induced at the transition, serving as a good probe for detecting the magnetism of Mn spins in a square lattice.