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From itinerant antiferromagnetism towards localized ferromagnetism in UNi(Al,Ga) |
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| Authors: | H Maletta V Sechovsky P A Veenhuizen F R de Boer L Havela G Hilscher |
| Institution: | (1) Institut für Festkörperforschung, Kernforschungsanlage Jülich, Postfach 1913, D-5170 Jülich, Federal Republic of Germany;(2) Natuurkundig Laboratorium, Universiteit van Amsterdam, Valckenierstraat 65, NL-1018 XE Amsterdam, The Netherlands;(3) Present address: Department of Metal Physics, Charles University, Ke Karlovu 5, CS-121 16 Prague, Czechoslovakia;(4) Institut für Experimentalphysik, Technische Universität, Karlsplatz 13, A-1040 Wien, Austria |
| Abstract: | UNiAl is an itinerant antiferromagnet with a transition temperature of 18 K and a huge low-temperature Sommerfeld coefficient of 167 mJ/K2 mole U atoms. A systematic study of the pseudoternary series UNiAl1-xGa x by means of magnetic and specific-heat measurements is presented. The data are interpreted as evidence for a transition from antiferromagnetism to ferromagnetism forx>0.4 with more localized features in the Ga-rich compounds. Forx=0.4 competition of ferromagnetic and antiferromagnetic interactions causes a complicated behaviour characterized by two types of magnetic transitions. Huge magnetocrystalline anisotropy is responsible for the rather anomalous behaviour of the ferromagnetic compositions. |
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