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Structure and magnetic properties of U2Fe3Ge (Articolo in rivista)

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Dhar, SK; Shah, KV; Bonville, P; Manfrinetti, P; Wrubl, F (2008)
Structure and magnetic properties of U2Fe3Ge
in Solid state communications (Print)
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\"[Dhar, S. K.; Shah, K. V.] TIFR, DCMPMS, Bombay 400005, Maharashtra, India; [Bonville, P.] DSM SPEC, Ctr Etud Saclay, F-91191 Gif Sur Yvette, France; [Manfrinetti, P.; Wrubl, F.] Univ Genoa, Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy; [Manfrinetti, P.] INFM, LAMIA Lab, CNR, I-16152 Genoa, Italy (literal)

Titolo

Abstract

We have identified a new compound of composition U2Fe3Ge, which crystallises in the hexagonal, C14 Laves phase MgZn2 type structure. Fe and Ge occupy randomly the sites of the Zn Sublattice. The lattice volume increases by about 4.3% compared to the parent cubic Laves phase compound UFe2. The magnetic properties of U2Fe3Ge have been probed by using magnetization, resistivity, heat capacity and Fe-57 Mossbauer spectroscopy. The compound orders ferromagnetically near 55 K in a state which is magnetically weaker than in UFe2. The latter is inferred from a lower saturated magnetic moment and hyperfine field at the Fe site. Resistivity shows a T 2 behaviour at low temperatures. Both the coefficient of the T-2 term in the resistivity and the Sommerfeld coefficient, gamma, in U-2 Fe3Ge ire slightly higher compared to that in UFe2. (c) 2008 Elsevier Ltd. All rights reserved. (literal)

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