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The tetragonal intermetallic compounds U(2)Ni(2)In and U(2)Rh(2)Sn have been studied by means of specific-heat, electrical-resistivity, and neutron-diffraction techniques. At low temperatures, both compounds order antiferromagnetically in a magnetic unit cell doubled along the c axis, and we find 5f moments of 0.60 and 0.38 µ(B)/U atom for U(2)Ni(2)In and U(2)Rh(2)Sn, respectively. For U(2)Ni(2)In, our refinement also indicates a possible Ni moment of 0.37 µ(B) perpendicular to the U moments. We discuss the development of the 5f moments together with findings on other isostructural U(2)T(2)X (T=transition metal, X=In, Sn) compounds, and confirm that the trends expected due to 5f-ligand hybridization also hold for this family of uranium compounds. Our analysis indicates different arrangements of the 5f moments in the two compounds (noncollinear arrangement within the basal plane for U(2)Ni(2)In and collinear arrangement along the c axis for U(2)Rh(2)Sn, although both compounds have nearest-neighbour U-U distances along the c axis. This would mean that the magnetocrystalline anisotropy in U(2)T(2)X compounds is not determined by nearest-neighbour U-U links alone.

Additional information

Authors: NAKOTTE N ET AL, Los Alamos National Laboratory, Los Alamos Neutron Scattering Center (US);PROKES K ET AL, University of Amsterdam, Van der Waals-Zeeman Institute (NL);HAVELA L ET AL, Charles University, Department of Metal Physics, Prague (CZ);PEREIRA L C J ET AL, JRC Karlsruhe (DE);TROUW F,
Bibliographic Reference: Article: Physical Review B Condensed Matter, Vol. 53 (1996) No. 6, pp. 3263-3271
Record Number: 199710403 / Last updated on: 1997-04-23
Original language: en
Available languages: en