Magnetic Properties of UFe2+x Prepared by Splat Cooling

L. Havela a, K. Miliyanchuk a, J. Pešička, a, A.P. Gonçalves b, J.C. Waerenborgh b, L.C.J. Pereira b, E. Šantavá c and J. Šebek c a Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic b Dep. Quimica, Instituto Tecnolgico e Nuclear, 2686-953 Sacavém, Portugal c Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic

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Received: 9 07 2007;

A series od UFe2+x materials was prepared using splat cooling. The Laves phase structure can accommodate up to 0.3 Fe excess, while TC is enhanced from 172 K to approximately 240 K. Higher Fe concentration leads to the segregation of α-Fe. 57Fe Mössbauer spectroscopy indicates higher Fe magnetic hyperfine fields on Fe nuclei occupying the U sublattice than for the regular Fe sites.

DOI: 10.12693/APhysPolA.113.247 PACS numbers: 71.28.+d, 75.50.Bb