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Studies of the magnetic phase diagram of the U(Ni1− xCux)2Si2system

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
219
Identifiers
DOI: 10.1016/0925-8388(94)05056-2
Keywords
  • Actinides
  • Neutron Diffraction
  • A.C. Susceptibility
  • Magnetic Structures
  • Magnetic Phase Diagrams
Disciplines
  • Physics

Abstract

Abstract Polycrystalline U(Ni 1− x Cu x ) 2Si 2 solid solutions have a tetragonal ThCr 2Si 2 type crystal structure. Antiferromagnetic (AF) transitions, observed by measurements of a.c. susceptibility for x = 0.10, 0.25, and 0.50, are confirmed by neutron diffraction. The AF structures are of type I (+ − + −) with k = (0,0,1) below T 0 = 108±5 K for x = 0.10 (with a possible incommensurate phase at 108–135 K), T N = 151±3 K for x = 0.25, and T N = 150±2 K for x = 0.50. The a.c. susceptibility transition for x = 0.75 is associated with the three magnetic structures observed by neutron diffraction: AF I, ferrimagnetic (+ + −) and AF IA (+ + − −), with k = (0,0,1), (0,0, 2 3 ) and (0,0, 1 2 ) , and T N = 120±3, 115±4 and 110±3 K respectively. Including previous neutron results on single-crystal UNi 2Si 2 and powdered UCu 2Si 2, a magnetic phase diagram of the U(Ni 1− x Cu x ) 2Si 2 system is proposed and discussed.

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