Multiferroic (Ferroelastic/Magnetic) Phase Transitions in KMnF3

DOI

KMnF3 perovskite undergoes 3 structural, and two magnetic phase transitions on cooling from 300 K to 2 K. Above 185 K the compound is in the aristotype structure, on cooling below 185 K it undergoes a weakly first order zone boundary phase transition to a structure in space group I4/mcm with Glazer symbol a0a0c-. At the Neel temperature (87 K) it undergoes a second weakly first order transition to an as yet uncharacterised phase, probably space group Cmcm. At 82 K it undergoes a second magnetic/structural transition to another uncharacterised phase, probably in space group Pnma. We propose to carry out a full structural and magnetic characterisation of the 4 phases of KMnF3 including the evolution of the spontaneous strains and the nature of the phase coexistence in the first order transitions on heating and cooling.

Identifier
DOI https://doi.org/10.5286/ISIS.E.67766878
Metadata Access https://icatisis.esc.rl.ac.uk/oaipmh/request?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:icatisis.esc.rl.ac.uk:inv/67766878
Provenance
Creator Dr Kevin Knight
Publisher ISIS Neutron and Muon Source
Publication Year 2018
Rights CC-BY Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Contact isisdata(at)stfc.ac.uk
Representation
Resource Type Dataset
Discipline Photon- and Neutron Geosciences
Temporal Coverage Begin 2015-12-03T00:00:00Z
Temporal Coverage End 2015-12-07T00:00:00Z