Structural and magnetic properties of UCo sub 2 Ge sub 2
Journal Article
·
· Journal of Applied Physics; (USA)
- Kamerlingh Onnes Laboratorium der Rijksuniversiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands (NL)
We have studied the effect of annealing on the structural and magnetic properties of UCo{sub 2}Ge{sub 2} and thereby find the existence of two different crystallographic structures. The as-cast, high-temperature (HT) phase adopts a crystal structure with symmetry lower than {ital I}4/{ital mmm}; after annealing at 750 {degree}C for 5 days the ThCr{sub 2}Si{sub 2} ({ital I}4/{ital mmm}) structure is formed. Additionally, the length of the {ital c} axis in these tetragonal structures changes dramatically: whereas the HT phase has a {ital c} parameter of {approx}9.3 A, the low-temperature (LT), annealed phase has a much larger {ital c} axis of {approx}9.9 A. This expansion of the unit cell greatly influences the magnetic properties of the material: while the LT sample orders antiferromagnetically at 174 K, the HT one does not order magnetically down to 350 mK. The antiferromagnetic transition is clearly indicated by our magnetization, resistivity and specific heat measurements.
- OSTI ID:
- 5694959
- Journal Information:
- Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:8; 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
ANNEALING
ANTIFERROMAGNETISM
COBALT ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
GERMANIUM ALLOYS
HEAT TREATMENTS
LATTICE PARAMETERS
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETISM
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
TETRAGONAL LATTICES
ULTRALOW TEMPERATURE
URANIUM ALLOYS
VERY LOW TEMPERATURE
360104* -- Metals & Alloys-- Physical Properties
ACTINIDE ALLOYS
ALLOYS
ANNEALING
ANTIFERROMAGNETISM
COBALT ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
GERMANIUM ALLOYS
HEAT TREATMENTS
LATTICE PARAMETERS
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETISM
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
TETRAGONAL LATTICES
ULTRALOW TEMPERATURE
URANIUM ALLOYS
VERY LOW TEMPERATURE