Magnetic ordering in U(M,M prime ) sub 2 Ge sub 2 compounds (M,M prime =Co,Ni,Cu)
Journal Article
·
· Journal of Applied Physics; (USA)
- Nuclear Research Centre-Negev, P. O. Box 9001, 84 190 Beer-Sheva, Israel (IL)
Several U(M,M{prime}){sub 2}Ge{sub 2} compounds (M,M{prime}=Co,Ni,Cu) have been studied by neutron diffraction. U(Co{sub 1{minus}{ital x}}Cu{sub {ital x}}){sub 2}Ge{sub 2} and UNiCuGe{sub 2} exhibit ThCr{sub 2}Si{sub 2}-type tetragonal structure, with {ital a}=4.02--4.10 A and {ital c}=9.86--10.25 A, and a magnetically ordered uranium sublattice with moments along {ital c}. The ordering is antiferromagnetic with a wave vector {bold k}=(0,0,1) for {ital x}=0,0.25, and 0.50 and UNiCuGe{sub 2} ({ital T}{sub {ital N}}=175, 130, 100, and 140 K, respectively), and ferromagnetic for {ital x}=0.75 ({ital T}{sub {ital C}}=102 K) and 1 ({ital T}{sub {ital C}}=107 K). In UCoNiGe{sub 2} ({ital a}=4.07 A, {ital c}=9.52 A) no magnetic ordering has been found down to 10 K. Two other samples of UCo{sub 2}Ge{sub 2} ({ital a}=4.04 A, {ital c}=9.44 and 9.38 A) were previously reported not to order magnetically down to 4.2 K. The absence of magnetic ordering is related to smaller {ital c} parameters and lower crystal symmetry.
- OSTI ID:
- 6949858
- Journal Information:
- Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 67:9; ISSN 0021-8979; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACTINIDE ALLOYS
ALLOYS
ANTIFERROMAGNETIC MATERIALS
COBALT ALLOYS
COHERENT SCATTERING
COPPER ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
DISPERSIONS
EXPERIMENTAL DATA
FERROMAGNETIC MATERIALS
GERMANIUM ALLOYS
INFORMATION
MAGNETIC MATERIALS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MATERIALS
MIXTURES
NEUTRON DIFFRACTION
NICKEL ALLOYS
NUMERICAL DATA
PHYSICAL PROPERTIES
SCATTERING
SOLID SOLUTIONS
SOLUTIONS
TETRAGONAL LATTICES
ULTRALOW TEMPERATURE
URANIUM ALLOYS
360104* -- Metals & Alloys-- Physical Properties
ACTINIDE ALLOYS
ALLOYS
ANTIFERROMAGNETIC MATERIALS
COBALT ALLOYS
COHERENT SCATTERING
COPPER ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
DISPERSIONS
EXPERIMENTAL DATA
FERROMAGNETIC MATERIALS
GERMANIUM ALLOYS
INFORMATION
MAGNETIC MATERIALS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MATERIALS
MIXTURES
NEUTRON DIFFRACTION
NICKEL ALLOYS
NUMERICAL DATA
PHYSICAL PROPERTIES
SCATTERING
SOLID SOLUTIONS
SOLUTIONS
TETRAGONAL LATTICES
ULTRALOW TEMPERATURE
URANIUM ALLOYS