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Neutron-diffraction study of the evolution of antiferromagnetic order in UPt3 doped with Pd

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arxiv cond-mat/9903328 v1 pith:PEZ2KRFQ submitted 1999-03-22 cond-mat.str-el cond-mat.supr-con

R.J. Keizer , A. de Visser , A.A. Menovsky , J.J.M. Franse , B. Fak , J.-M. Mignot This is my paper · ORCID
classification cond-mat.str-elcond-mat.supr-con
keywords antiferromagneticmomentorderphaseu-atomupt3dopinglmaf
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Neutron-diffraction experiments have been carried out on U(Pt1-xPdx)3 single crystals (x<= 0.05). The small-moment antiferromagnetic order (SMAF) reported for pure UPt3 is robust upon doping and persists till at least x= 0.005. The ordered 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 does not vary with Pd contents. The order parameter for the SMAF has an unusual quasi-linear temperature variation. For x>= 0.01 a large moment antiferromagnetic 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 infer that the antiferromagnetic instability in U(Pt1-xPdx)3 is located in the range 0.5-1 at.% Pd.

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