Intermetallic compound; Uranium; Indium; Tin; Structure; Magnetic properties; Specific heat; Electrical resisitivity; Neutron diffraction
Abstract :
[en] The tetragonal intermetallic compounds U2Pd2In and U2Pd2Sn have been studied by means of magnetic susceptibility, magnetization, 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 γ of 393 and 203 mJ/mol f.u. K**2, respectively. At low temperature, the nearest-neighbor U-U spacing is along the c axis in both compounds, though in U2Pd2Sn 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-neighbor U-U links; the moments are almost invariably oriented perpendicular to such links. This is also the case for U2Pd2In and U2Pd2Sn, where the moments lie in the tetragonal basal plane in a canted arrangement along [110] and [1¯10] directions. 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) Bohr magneton and (2.0±0.1) Bohr magneton per U atom in U2Pd2In and U2Pd2Sn, respectively.
Disciplines :
Physics
Author, co-author :
Purwanto, A.; Los Alamos National Laboratory > Los Alamos Neutron Scattering Center
Robinson, R. A.; Los Alamos National Laboratory > Los Alamos Neutron Scattering Center
Havela, Ladislav; Charles University > Department of Metal Physics
Sechovsky, Vladimir; Charles University > Department of Metal Physics
Svoboda, P.; Charles University > Department of Metal Physics
Nakotte, Heinz; University of Amsterdam > Van der Waals-Zeeman Laboratory
Prokes, Karel; University of Amsterdam > Van der Waals-Zeeman Laboratory
de Boer, Frank R.; University of Amsterdam > Van der Waals-Zeeman Laboratory
Seret, Alain ; European Commission (EC) - Joint Research Centre (JRC) > Institute for Transuranium Elements
Winand, Jean-Marc; European Commission (EC) - Joint Research Centre (JRC) > Institute for Transuranium Elements
Rebizant, Jean; European Commission (EC) - Joint Research Centre (JRC) > Institute for Transuranium Elements
Spirlet, Jean-Claude; European Commission (EC) - Joint Research Centre (JRC) > Institute for Transuranium Elements
Language :
English
Title :
Magnetic ordering in U2Pd2In and U2Pd2Sn
Publication date :
01 September 1994
Journal title :
Physical Review. B, Condensed Matter
ISSN :
0163-1829
eISSN :
1095-3795
Publisher :
American Physical Society, United States - Maryland
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