Three-dimensional magnetic structures and rare-earth magnetic ordering in Nd sub 2 CuO sub 4 and Pr sub 2 CuO sub 4
- Department of Physics, Tohoku University, Aoba-ku, Sendai 980 (Japan)
- Nippon Telegraph and Telephone Opto-Electronics Laboratories, Nippon Telegraph and Telephone Corporation, Tokai, Ibaraki 319-11 (Japan)
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA (USA)
- Physics Department, Brookhaven National Laboratory, Upton, NY (USA)
The three-dimensional (3D) magnetism present in Nd{sub 2}CuO{sub 4} and Pr{sub 2}CuO{sub 4} has been examined in neutron-scattering experiments. Antiferromagnetic long-range order of the Cu{sup 2+} moments develops below {ital T}{sub {ital N}}=255 K in both compounds. In Nd{sub 2}CuO{sub 4} a series of magnetic phase transitions in which the Cu{sup 2+} spins reorient has also been observed below {ital T}{sub {ital N}}, while in Pr{sub 2}CuO{sub 4} the 3D Cu{sup 2+} spin structure is stable. No changes in the crystalline structure of Nd{sub 2}CuO{sub 4} associated with the spin-reorientation transitions were found. Induced ordering of the rare-earth magnetic moments has been observed in both compounds. The Nd{sup 3+} (Pr{sup 3+}) magnetic moments align parallel (antiparallel) to Cu{sup 2+} moments which are nearest neighbors along the {ital c} axis, and the ordered moments of the rare-earth ions were determined to be {similar to}1.3{mu}{sub {ital B}} for Nd{sup 3+} at 0.4 K and {similar to}0.08{mu}{sub {ital B}} for Pr{sup 3+} at 8 K. The temperature-dependent Pr{sup 3+} moment is shown to be proportional to the Cu{sup 2+} moment times the bulk susceptibility. In this paper we also discuss the role of the {ital XY} anisotropy in the 3D ordering.
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5777501
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:16; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ANTIFERROMAGNETISM
CHALCOGENIDES
COHERENT SCATTERING
CRYSTALS
DIFFRACTION
HEAT TREATMENTS
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETISM
MONOCRYSTALS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NEUTRON DIFFRACTION
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
RARE EARTH COMPOUNDS
SCATTERING
SPIN ORIENTATION
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE