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Magnetization and specific heat in U1-xLaxGa2 and magnetocaloric effect in UGa2

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5 Author(s)
da Silva, L.M. ; Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, Sao Paulo-13083-970 Campinas, Brazil ; Gandra, F.G. ; Medina, A.N. ; dos Santos, A.O.
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We have investigated the properties of the ferromagnetic series U1-xLaxGa2. The magnetization results show a reduction of μeff and of Tc when x is increased. The electronic coefficient γ of the specific heat increases to a maximum of 260 mJ/Umol K2 at x=0.75. This behavior is probably consequence of delocalization of 5f electrons, causing enhancement of the density of states. For x=0.9 the ordering disappears and a non-Fermi-liquid behavior is observed. UGa2 also presented a significant magnetocaloric effect of ΔSmag=-3.5 J/kg K at 120 K and H=7 T which can be modified by chemical pressure.

Published in:

Journal of Applied Physics  (Volume:97 ,  Issue: 10 )

Date of Publication:

May 2005

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