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The tetragonal intermetallic compounds U(2)Pd(2)In and U(2)Pd(2)Sn have been studied by means of magnetic susceptibility, magnetisation, specific heat, electrical resistivity, and X-ray and neutron diffraction techniques. The compounds order antiferromagnetically at 36 and 41 K, respectively, and have enhanced electronic specific heat coefficients. At low temperature, the nearest neighbour U-U spacing is along the c axis in both compounds, though in U(2)Pd(2)Sn the in-plane U-U distance is shorter at room temperature. This crossover is due to motion of the U atoms within the cell rather than anisotropy of the thermal contraction. It is now well established in several classes of (1:1:1) uranium ternary intermetallic compounds that the strong magnetic anisotropy is correlated with the direction of nearest neighbour U-U links; the moments are almost invariably oriented perpendicular to such links. Of four such Shubnikov subgroups of P4/mbm, one is clearly preferred by the data. At 10 K, the magnetic moments extracted are (1.6 +/- 0.2)mu(B) and (2.0 +/- 0.1)mu(B) per U atom in U(2)Pd(2)In and U(2)Pd(2)Sn, respectively.

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Authors: PURWANTO A, Los Alamos National Laboratory, Los Alamos Neutron Scattering Center, New Mexico (US);ROBINSON R A, Los Alamos National Laboratory, Los Alamos Neutron Scattering Center, New Mexico (US);HAVELA L ET AL., Charles University, Department of Metal Physics, Prague (CZ);IVAKOTTE H ET AL., University of Amsterdam, Van der Waals-Zeeman Laboratory (NL);SERET A ET AL., JRC Karlsruhe (DE)
Bibliographic Reference: Article: Physical Review B, Vol. 50 (1994) No. 10, pp. 6792-6801
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