Structural Changes Related to the Magnetic Transitions in Hexagonal InMnO3

TL;DR

This study investigates the structural and magnetic phase transitions in InMnO3, revealing strong coupling between lattice distortions and magnetic order, with potential modulation by external pressure.

Contribution

It provides detailed insights into the structural changes associated with magnetic transitions in InMnO3, highlighting the coupling between lattice distortions and magnetic ordering.

Findings

Identification of two magnetic transitions at ~118 K and ~42 K.

Enhanced local distortions linked to MnO5 tilting.

Strong lattice-spin coupling observed near transition temperatures.

Abstract

Two magnetic ordering transitions are found in InMnO3, the paramagnetic to antiferromagnetic transition near ~118 K and a lower possible spin rotation transition near ~42 K. Multiple length scale structural measurements reveal enhanced local distortion found to be connected with tilting of the MnO5 polyhedra as temperature is reduced. Strong coupling is observed between the lattice and the spin manifested as changes in the structure near both of the magnetic ordering temperatures (at ~42 K and ~ 118 K). External parameters such as pressure are expected to modify the coupling.