Bulg. J. Phys. vol.34 no.s1 (2007), pp. 185-198

Neutron Powder Diffraction Studies on Magnetoresistive Oxides

J.A. Alonso1, J. Sánchez-Benítez2, D. Sánchez3, H. Falcón1, M.J. Martínez-Lope1, A. Muñoz4
1Instituto de Ciencia de Materiales de Madrid, CSIC. Cantoblanco, E-28049 Madrid, Spain
2Centre for Science at Extreme Conditions and School of Engineering and Electronics, University of Edinburgh, King's Buildings, Mayfield Road, Edinburgh EH9 3JZ, UK
3Department of Materials Science and Metallurgy, University of Cambridge Pembroke Street Cambridge CB2 3QZ, UK
4Departamento de Física, Escuela Politéchnica Superior, Universidad Carlos III, Avsa Universidad 30, E-28911 Leganés-Madrid, Spain
Abstract. We report on some results on CMR oxide materials which have been prepared and characterized by neutron diffraction in the last few years, in particular some new derivatives of the double perovskites CaCu3Mn4O12 and Sr2FeMoO6. NPD techniques have allowed us to address different structural problems, related with the presence of oxygen vacancies, tilting of the framework octahedra in perovskite-type compounds, order-disorder issues in double perovskites, etc, as well as to acquire a unique microscopic view of the magnetic ordering processes in these fascinating systems.

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