Magnetic phase transitions in UNi sub 2 Si sub 2

Journal Article · Mon Apr 15 04:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.348237· OSTI ID:5689287

Rebelsky, L ^[1]; Lin, H; Collins, M F; Garrett, J B ^[2]; Buyers, W J.L. ^[3]; McElfresh, M W ^[4]; Torikachvili, M S ^[5]

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1. Department of Physics, Brookhaven National Laboratories, Upton, New York 11973 (USA)
2. Institute for Material Research, McMaster University, Hamilton, Ontario L8S 4M1, (Canada)
3. AECL, Chalk River, Ontario K0J 1J0, (Canada)
4. IBM, Yorktown Heights, New York 10598 (USA)
5. San Diego State University, San Diego, California 92182 (USA)

We report neutron diffraction measurements on a single crystal of UNi{sub 2} Si{sub 2}. Three magnetically ordering phases are observed below 123 K with the magnetic moment parallel to the {ital c}-axis in all three phases. The low temperature ({ital T}{lt}53 K) phase is a superposition of a commensurate spin density wave with wave vector {ital q} = (0 0 0.667{plus minus}0.002) and a ferromagnetic ordered moment of 1.1{plus minus}0.3{mu}{sub {ital B}}, the intermediate (53 K{lt}{ital T}{lt}103 K) is a simple body-centered tetragonal antiferromagnet with an ordered magnetic moment of 1.8{plus minus}0.2{mu}{sub {ital B}} and the high-temperature phase is an incommensurate spin density wave with wave vector {bold q} = (0 0 0.744{plus minus}0.002) at 110 K. The phase transitions at 53 and 103 K are first order.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5689287
• 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

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
360603 -- Materials-- Properties
ACTINIDE COMPOUNDS
COHERENT SCATTERING
CRYSTALS
DIFFRACTION
FERROMAGNETISM
LOW TEMPERATURE
MAGNETISM
MONOCRYSTALS
NEUTRON DIFFRACTION
NITRIDES
NITROGEN COMPOUNDS
PHASE TRANSFORMATIONS
PNICTIDES
SCATTERING
SILICIDES
SILICON COMPOUNDS
SPIN WAVES
URANIUM COMPOUNDS
URANIUM NITRIDES
URANIUM SILICIDES
VERY LOW TEMPERATURE