Ferromagnetic metallic Sr-rich Ln1/2A1/2CoO3 cobaltites with spontaneous spin rotation
The Pr0.50Sr0.50CoO3 perovskite exhibits unique magnetostructural properties among the rest of ferromagnetic (FM)/metallic Ln0.50Sr0.50CoO3 compounds. The sudden orthorhombic-tetragonal (Imma→I4/mcm) structural transition produces an unusual magnetic behavior vs temperature and external magnetic fie...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/252283 |
| Acceso en línea: | http://hdl.handle.net/10261/252283 |
| Access Level: | acceso abierto |
| Palabra clave: | Crystal structures Magnetic anisotropy Magnetic order Magnetic phase transitions Structural phase transition Cobaltates Ferromagnets Perovskite |
| Sumario: | The Pr0.50Sr0.50CoO3 perovskite exhibits unique magnetostructural properties among the rest of ferromagnetic (FM)/metallic Ln0.50Sr0.50CoO3 compounds. The sudden orthorhombic-tetragonal (Imma→I4/mcm) structural transition produces an unusual magnetic behavior vs temperature and external magnetic fields. The symmetry change is responsible for a spontaneous spin rotation in this metallic oxide. We have studied half-doped Ln0.50(Sr1−xAx)0.50CoO3 cobaltites varying the ionic radius rA of A-site cations (divalent cations and lanthanides) to complete the T-rA phase diagram. The influence of the structural distortion and the A-cation size for the occurrence of a spontaneous spin reorientation in the metallic state has been investigated. As the magnetization reorientation is driven by the temperature-induced collapse of the orthorhombic distortion, a careful investigation of the structural symmetry is presented, varying the structural distortion of the Sr-rich half-doped cobaltites by means of both compositional and temperature changes. The region in the phase diagram of these FM/metallic cobaltites where Fm′m′m magnetic symmetry replaces Im′m′a was determined. In that region, the magnetization direction has rotated 45 ° within the a−b plane from the former to the latter. |
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