Magnetic transitions and isotropic versus anisotropic magnetic behaviour of [CH3NH3][M(HCOO)3] M = Mn2+, Co2+, Ni2+, Cu2+ metal–organic perovskites
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Título: | Magnetic transitions and isotropic versus anisotropic magnetic behaviour of [CH3NH3][M(HCOO)3] M = Mn2+, Co2+, Ni2+, Cu2+ metal–organic perovskites |
Autor/a: | Pato Doldán, Breogán Gómez Aguirre, Lilián Claudia Hansen, Anders P. Mira Pérez, Jorge Castro García, Socorro Sánchez Andújar, Manuel Señarís Rodríguez, María Antonia Zapf, Vivien Singleton, John |
Centro/Departamento: | Universidade de Santiago de Compostela. Departamento de Física Aplicada |
Data: | 2016 |
Editor: | Royal Society of Chemistry |
Cita bibliográfica: | J. Mater. Chem. C, 2016,4, 11164-11172 |
Resumo: | Here we present an in-depth study of the magnetic properties of a family of metal–organic perovskites ABX3, [CH3NH3][M(HCOO)3] in which A = CH3NH3+ is the methylammonium cation, B = M is a divalent metal cation (Mn2+, Co2+, Ni2+ or Cu2+), and X is the formate anion (HCOO−). The magnetic properties have been measured on powdered samples and along the different orientations of mm-sized single crystals. They display spin-canted weak ferromagnetism with Néel temperatures of 8.0 K (Mn2+), 15.7 K (Co2+) and 34 K (Ni2+), which are inversely proportional to the ionic radii of the metal cations. The Cu2+ member displays low-dimensional magnetism as a result of orbital ordering of the Cu2+ d orbitals originating from a Jahn–Teller distortion. Pulsed-field magnetization experiments (fields of up to 60 T at temperatures down to 0.6 K) show that Mn2+, Co2+ and Ni2+ formates display cation-characteristic spin flop transitions. A saturation magnetization value of 5 μB (at 12.5 T) was observed for Mn2+, meanwhile the Co2+ formate shows an orientation dependent quasi saturation (5.1 μB at 21 T along [101] vs. 5.8 μB at 26 T along [010]). The different isotropic/anisotropic behaviour can be explained by the orbital contribution to the magnetic response |
Versión do editor: | https://doi.org/10.1039/C6TC03992H |
URI: | http://hdl.handle.net/10347/24334 |
DOI: | 10.1039/C6TC03992H |
E-ISSN: | 2050-7534 |
Dereitos: | © Royal Society of Chemistry 2016. Open Access Article. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence |
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