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Neutron-diffraction experiments have been carried out on U(Pt1-xPdx)3 singlecrystals (x<= 0.05). The small-moment antiferromagnetic order (SMAF) reportedfor pure UPt3 is robust upon doping and persists till at least x= 0.005. Theordered moment grows from 0.018(2) mB/U-atom for pure UPt3 to 0.048(8)mB/U-atom for x= 0.005. The Neel temperature, TN, is approximately 6 K and doesnot vary with Pd contents. The order parameter for the SMAF has an unusualquasi-linear temperature variation. For x>= 0.01 a large momentantiferromagnetic phase (LMAF) is found. For this phase at optimum doping (x=0.05) TN attains a maximum value of 5.8 K and the ordered moment equals 0.63(5)mB/U-atom. TN(x) for the LMAF follows a Doniach-type phase diagram. We inferthat the antiferromagnetic instability in U(Pt1-xPdx)3 is located in the range0.5-1 at.% Pd.Comment: 21 pages text (PS), 6 pages with 11 Figs. (PS), submitted to  Phys.Rev.

physical review. b, condensed matter

Neutron-diffraction study of the evolution of antiferromagnetic order in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">UPt</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>doped with Pd

Neutron-diffraction study of the evolution of antiferromagnetic order inUPt3doped with Pd