Spin reorientation, magnetization reversal, and negative thermal expansion observed in RFe0.5Cr0.5O3 perovskites (R = Lu,Yb,Tm)
Three members of the perovskite family RFe0.5Cr0.5O3 (R = Lu,Yb, and Tm) have been synthesized and characterized. A systematic study of the crystal and magnetic structures was performed by neutron powder diffraction combined with magnetization measurements. All these compounds crystallize in a Pbnm...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2016 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/27089 |
| Acceso en línea: | http://hdl.handle.net/11336/27089 |
| Access Level: | acceso abierto |
| Palabra clave: | Perovskites Spin Reorientation Negative Thermal Expansion Neutrons Diffraction https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| Sumario: | Three members of the perovskite family RFe0.5Cr0.5O3 (R = Lu,Yb, and Tm) have been synthesized and characterized. A systematic study of the crystal and magnetic structures was performed by neutron powder diffraction combined with magnetization measurements. All these compounds crystallize in a Pbnm orthorhombic unit cell and they are already antiferromagnetic at room temperature. The study of the magnetic structure vs temperature showed the occurrence of a progressive spin reorientation from TM 4 to TM 2 for the transition metal sublattice, and in the Tm-based sample, a long-range magnetic order of the Tm3+ sublattice was found (R 8 ). These results are in excellent agreement with the magnetic susceptibility measurements. No spin reorientation is observed in the Lu-based sample for which a magnetization reversal at a compensation temperature Tcomp = 225 K was detected. A clear magnetostrictive effect was observed in the samples with R = Yb and Tm associated with a negative thermal expansion and was assigned to a magnetoelastic effect produced by repulsion between the magnetic moments of neighboring transition metal ions. |
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