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

• Autor(es): Gonçalves, A. P. ; Estrela, P. ; Waerenborgh, J. C. ; Paixão, J. A. ; Bonnet, M. ; Spirlet, J. C. ; Godinho, M. ; Almeida, M.
• Data: 1998
• Identificador Persistente: http://hdl.handle.net/10316/4564
• Origem: Estudo Geral - Universidade de Coimbra
• Assunto(s): ThMn12-type structure; Uranium intermetallics; Magnetic intermetallics; Actinides; Magnetic anisotropy
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

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. http://www.sciencedirect.com/science/article/B6TJJ-3V7WTYX-N/1/f7893080a7f27a628198f02aeb40fe26