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Microscopic insights on the multiferroic perovskite‐like [CH3NH3][Co(COOH)3] compound

AuthorsMazzuca, Lidia; Cañadillas-Delgado, Laura; Fabelo, Óscar; Rodríguez-Velamazán, J. A.; Luzón, Javier; Vallcorba, Oriol ; Simonet, Virginie; Colin, Claire V.; Rodríguez-Carvajal, Juan
KeywordsMagnetic structure
Metal-organic compounds
Multiferroic materials
Neutron diffraction
Phase transitions
Issue Date2018
CitationChemistry - A European Journal 24(2): 388-399 82018)
AbstractThe characterization of the crystal structure, phase transitions, magnetic structure and dielectric properties has been carried out on [CH3 NH3 ][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.
Publisher version (URL)https://doi.org/10.1002/chem.201703140
Appears in Collections:(ICMA) Artículos
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