MAGNETIC STRUCTURES OF THULIUM

Journal Article · Fri Jun 01 04:00:00 EDT 1962 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.126.1672· OSTI ID:4820290

Koehler, W C; Cable, J W; Wollan, E O; Wilkinson, M K

Neutron diffraction studies on polycrystalline and singlecrystal specimens of thulium were made at room temperature to 1.3 deg K. The results are interpreted by a method exhibiting explicitly the Fourier components of the distribution of magnetic moments on the lattice sites. At about 56 deg K, the Neel temperature, a simple oscillating zcomponent-type antiferromagnetic structure is developed. At approximately 40 deg K, nonzero Fourier coefficients of overtones of the fundamental observed at higher teraperatures are first detected. At 4.2 deg K, the magnetic structure of thulium is a type of antiphase domain structure in which several layers of moments parallel to the + a/sub 3/ direction are followed by several layers in which the moments are oppositely directed. The sequence in thulium is --4, +3, --4, +3,... etc. Each atom has, within the precision of the experiments, an ordered moment of 7 mu s, and the ferrimagnetic structure has a net moment, parallel to the c axis, of 1 mu /sub B/ per atom. The fundamental period of the modulation remains constant over the whole range of teraperatures at a value corresponding to 3.5 a/sub 3/ periods. The scattering amplitude of thulium is b/sub Tm/ = (0.69 plus or minus 0.02) x 10/sup -12/ cm. (auth)

• Research Organization: Oak Ridge National Lab., Tenn.
• NSA Number: NSA-16-024204
• OSTI ID: 4820290
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 126; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ATOMS
CRYSTALS
DETECTION
DIFFRACTION
EQUATIONS
FERROMAGNETIC MATERIALS
FOURIER COMPONENTS
HIGH TEMPERATURE
LATTICES
LAYERS
MAGNETISM
METALS, CERAMICS, AND OTHER MATERIALS
MODULATION
NEEL TEMPERATURE
NEUTRONS
PHASE DIAGRAMS
SCATTERING
TEMPERATURE
THULIUM