Exploration of magnetic order in Pr0.5Ca0.5CoO3-δ (δ=0) below the metal-insulator transition
We have investigated the low temperature magnetic state of Pr0.5Ca0.5CoO3-δ with (δ=0) by means of resistivity, dc magnetization, susceptibility, magnetotransport and neutron diffraction. We find that below the metal-insulator transition (MIT) this system can be described as a paramagnetic insulator...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2010 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/367303 |
| Acceso en línea: | http://hdl.handle.net/10261/367303 |
| Access Level: | acceso abierto |
| Palabra clave: | Magnetic order Metal-insulator transition Cobaltites Perovskites |
| Sumario: | We have investigated the low temperature magnetic state of Pr0.5Ca0.5CoO3-δ with (δ=0) by means of resistivity, dc magnetization, susceptibility, magnetotransport and neutron diffraction. We find that below the metal-insulator transition (MIT) this system can be described as a paramagnetic insulator with dominant ferromagnetic interactions between Co atoms. In this regime, it presents a considerable negative magnetoresistance (20%-40%), while above MIT the magnetoresistance is negligible or even slightly positive. Neutron diffraction measurements reveal that there is no long-range ferromagnetic (FM) or antiferromagnetic (AFM) order. These results are in contradiction with the spin state picture previously drawn for this system. |
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