Microscopic Insights on the Multiferroic Perovskite‐Like [CH3NH3][Co(COOH)3] Compound

The characterization of the crystal structure, phase transitions, magnetic structure and dielectric properties has been carried out on [CH3NH3][Co(COOH)3] (1) perovskite‐like metal–organic compound through variable‐temperature single‐crystal and powder neutron and X‐ray diffraction and relative perm...

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Bibliographic Details
Published in:Chemistry : a European journal 2018-01, Vol.24 (2), p.388-399
Main Authors: Mazzuca, Lidia, Cañadillas‐Delgado, Laura, Fabelo, Oscar, Rodríguez‐Velamazán, J. Alberto, Luzón, Javier, Vallcorba, Oriol, Simonet, Virginie, Colin, Claire V., Rodríguez‐Carvajal, Juan
Format: Article
Language:English
Subjects:
Antiferromagnetism
Chemistry
Condensed Matter
Crystal structure
Dielectric properties
Diffraction
Electrical properties
Ferroelectricity
Ferromagnetism
Low temperature
Magnetic properties
Magnetic structure
metal–organic compounds
Multiferroic materials
Neutron diffraction
Permittivity
Phase transitions
Physics
Powder
Single crystals
Strongly Correlated Electrons
Structural analysis
X-ray diffraction
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Summary:The characterization of the crystal structure, phase transitions, magnetic structure and dielectric properties has been carried out on [CH3NH3][Co(COOH)3] (1) perovskite‐like metal–organic compound through variable‐temperature single‐crystal and powder neutron and X‐ray diffraction and relative permittivity measurements. The paraelectric to antiferroelectric‐like phase transition observed at around 90 K is triggered by a structural phase transition; the structural studies show a change from Pnma space group at RT (1A) to P21/n space group at low temperature (1B). This phase transition involves the occurrence of small distortions in the framework and counterions. Neutron diffraction studies have shown a magnetic order showing spontaneous magnetization below 15 K, due to the occurrence of a non‐collinear antiferromagnetic structure with a weak ferromagnetic component, mainly due to the single‐ion anisotropy of the CoII ions. The structural and magnetic phase transitions and dielectric properties show that [CH3NH3][Co(COOH)3] compound presents a multiferroic behaviour at zero‐field. The paraelectric to antiferroelectric‐like transition observed at around 90 K, coexists with a weak ferromagnetic signal below 15 K, which arises from a non‐collinear antiferromagnetic structure, mainly due to the single‐ion anisotropy of the CoII ions.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201703140