Magnetic properties of manganese-site substituted Y(Cu,Mn)O3
[EN] The magnetic properties of the solid solution YCuxMn1-xO3 have been investigated in the whole range of possible substitutions 0.30 ≤ x(Cu) ≤ 0.50. The χa.c. data showed the presence of minute amounts, undetectable by X-ray diffraction, of the antiferromagnetic Y2Cu2O5 phase, which did not inter...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2004 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/4422 |
| Acceso en línea: | http://hdl.handle.net/10261/4422 |
| Access Level: | acceso abierto |
| Palabra clave: | Perovskites Magnetic exchange Antiferromagnetism Substitution effects Perovskitas Interacciones de canje Antiferromagnetismo Efectos de la sustitución |
| Sumario: | [EN] The magnetic properties of the solid solution YCuxMn1-xO3 have been investigated in the whole range of possible substitutions 0.30 ≤ x(Cu) ≤ 0.50. The χa.c. data showed the presence of minute amounts, undetectable by X-ray diffraction, of the antiferromagnetic Y2Cu2O5 phase, which did not interfere with the overall magnetic behavior of the solid solution. The total effective moment of the paramagnetic state decreases continuously with x(Cu). The average moment per Mn ion was estimated after subtraction of the copper contribution, giving approximately 4.4 μB, independent of the Cu concentration ; this value corresponds to the magnetic moment expected for 50 % Mn3+ and 50 % Mn4+. A paramagnetic-to-antiferromagnetic transition is observed at TNéel = 21 K, also compositional-independent. The low temperature state, studied by ZFC/FC cycles and M(H) loops, reinforce the idea of antiferromagnetic interactions in these compounds. A very small ferromagnetic component giving rise to low coercive fields of the order of 800 Oe, was present for all Cu concentrations. Additional nuclear powder diffraction measurements show no specific magnetic structure, suggesting short range interactions. |
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