Phase separation in polycrystalline Pr0.5Sr0.5−xCaxMnO3
In this work we present electrical resistivity and magnetization (M) data as a function of temperature T and magnetic field H of polycrystalline Pr0.5Sr0.5−xCaxMnO3 (x = 0.1 and 0.2). Within a large T range we have observed the coexistence of the ferromagnetic (FM) and charge-ordered antiferromagnet...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2001 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/68587 |
| Acceso en línea: | http://hdl.handle.net/11336/68587 |
| Access Level: | acceso abierto |
| Palabra clave: | Phase Separation Manganite Free Energy Model Magnetism https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| Sumario: | In this work we present electrical resistivity and magnetization (M) data as a function of temperature T and magnetic field H of polycrystalline Pr0.5Sr0.5−xCaxMnO3 (x = 0.1 and 0.2). Within a large T range we have observed the coexistence of the ferromagnetic (FM) and charge-ordered antiferromagnetic phases. From the spontaneous magnetization in the M(H) curves we obtained the fraction of the FM phase XFM. We found that XFM is ˜20% at low T, and increases by increasing both T and H. Through a simple free-energy model driven by random disorder, we reproduce the T and H evolution of the phase-separation phenomena. We also show that a low-energy difference between the competing states is responsible for the dramatic effects that the disorder has on the physical properties. |
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