Crystallographic and magnetic properties of UFe5.8Al6.2 single crystals

• Autor(a) principal: Gonçalves, A. P.
• Data de Publicação: 1998
• Outros Autores: Estrela, P., Waerenborgh, J. C., Paixão, J. A., Bonnet, M., Spirlet, J. C., Godinho, M., Almeida, M.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10316/4564
• topic: ThMn12-type structure; Uranium intermetallics; Magnetic intermetallics; Actinides; Magnetic anisotropy

Single crystals of UFe5.8Al6.2 were characterised by X-ray and neutron diffraction, 57Fe Mössbauer spectroscopy and magnetisation. The structure refinement by X-ray and neutron diffraction shows a ThMn12-type structure, the Fe atoms fully occupying the 8f and partially occupying the 8j positions. Mössbauer spectra confirm these occupations and further indicate a magnetic ordering below 293 K. Magnetisation measurements show a ferromagnetic behaviour below 300 K, with a and b as easy directions and a spontaneous magnetisation of 10.4 [mu]B/f.u. at 5 K, due to the Fe occupation of 8j position. These single crystal results significantly differ from those previously obtained in UFe6Al6 polycrystalline samples obtained by melting and annealing.