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Uranium compounds can have an anisotropy that is considerably greater than that found in rare-earth compounds. Early estimates of K(1) in ferromagnetic US (T(C)=178 K), for example, were of above 1.0 E8 erg/cm3. On re-examining this cubic material K(1), in the range of reduced moment from 0.1 to 0.7, is found to vary logarithmically over almost 3 orders of magnitude. The highest measured value of K(1) is 2x1.0E8 erg/cm3 but an extrapolation, on arguments of symmetry, to moment of unity (i.e. T=0K) gives a value of approximately 1.0E10 erg/cm3, some 20 times more than found in TbFe(2) at 0K. The method used is with polarised neutrons. Because the neutron interaction with the magnetic moment is vectorial in nature, it is possible to determine individually the magnitude and direction of the moment in an applied field. In many cases this method has advantages over conventional methods, especially when the anisotropy is large.

Additional information

Authors: LANDER G H, JRC Karlsruhe (DE);BROOKS M S S, JRC Karlsruhe (DE);LEBECH B, RisÝ National Laboratory, Physics Department, Roskilde (DK);BROWN P J, Institut Laue-Langevin, Grenoble (FR);VOGT O, Laboratorium für Festkörperphysik, Zurich (CH);MATTENBERGER K, Laboratorium für Festkörperphysik, Zurich (CH)
Bibliographic Reference: Paper presented: 35th Annual Conference on Magnetism and Magnetic Materials, San Diego (US), Oct. 29 - Nov. 1, 1990
Availability: Available from (1) as Paper EN 35614 ORA
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