Magnetism of randomly distributed f atoms in (U{sub 1{minus}x}Nd{sub x})Co{sub 2}Ge{sub 2} solid solutions

Journal Article · Thu Jan 01 00:00:00 EST 1998 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.57.449· OSTI ID:565884

Caspi, E ^[1]; Kuznietz, M; Ettedgui, H; Pinto, H; Melamud, M ^[1]; Shaked, H ^[2]

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1. Nuclear Research Centre-Negev, P.O. Box 9001, 84190 Beer-Sheva (Israel)
2. Ben-Gurion University of the Negev, P.O. Box 653, 84105 Beer-Sheva (Israel)

Solid solutions of the (U{sub 1{minus}x}Nd{sub x})Co{sub 2}Ge{sub 2} system (x=0.25, 0.50, 0.75) are found by neutron diffraction to have tetragonal ThCr{sub 2}Si{sub 2}-type crystal structure (space group I4/mmm), same as their end compounds (x =0, 1). In the solid solutions, U and Nd atoms are randomly distributed in the basal planes. The end compounds and the solid solutions are paramagnetic at room temperature. At 12 K the (U,Nd) sublattice has the antiferromagnetic AF-I magnetic structure [+{minus}+{minus} stacking of ferromagnetic (U,Nd) planes along c], with moments parallel to the c axis. It is found that within a ferromagnetic basal plane the U magnetic moments are parallel to the Nd magnetic moments, unlike (U,Tb), where they are antiparallel. This shows that the {open_quotes}spin charge{close_quotes} rule for lanthanides extends to U-lanthanide systems. Neutron-diffraction and ac-susceptibility results are compared in order to investigate the character of the magnetic transition in the solid solutions. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 565884
• Journal Information: Physical Review, B: Condensed Matter, Vol. 57, Issue 1; Other Information: PBD: Jan 1998
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
SPACE GROUPS
URANIUM ALLOYS
SOLID SOLUTIONS
NEUTRON DIFFRACTION
PARAMAGNETISM
MAGNETIC MOMENTS
SPIN
CRYSTAL STRUCTURE
COBALT ALLOYS
GERMANIUM ALLOYS
NEODYMIUM ALLOYS
TETRAGONAL LATTICES
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
FERROMAGNETIC MATERIALS
ANTIFERROMAGNETIC MATERIALS
PHASE TRANSFORMATIONS