Magnetic excitations in chromium. II

Journal Article · Thu Feb 28 23:00:00 EST 1985 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.31.2892· OSTI ID:6014377

Grier, B H; Shirane, G; Werner, S A

Neutron scattering measurements on pure chromium metal have been performed under various conditions of experimental resolution, energy transfer, temperature, and magnetic field. The temperature and energy dependence of the commensurate-diffuse scattering surrounding the (0,0,1) point in reciprocal space has been followed from the spin-flip temperature (T/sub sf/ = 122 K) to temperatures as high as 700 K, well above the Neel point (T/sub N/ = 312 K). Magnetic correlations extending over 11 bcc unit cells persist to these high temperatures. The spectral width of the magnetic scattering is found to increase rapidly with temperature above T/sub N/. The importance of the commensurate-diffuse modes of excitation in the disappearance of the long-range-ordered spin-density-wave (SDW) state at T/sub N/ is discussed. The magnetic field dependence of the excitations in the transversely polarized SDW phase has been investigated and found to be absent. Evidence is also presented for the absence of a spin-wave energy gap greater than 50 ..mu..eV. We have placed the scattering in the paramagnetic phase on an absolute scale by normalizing to the integrated intensities of selected phonons, and have estimated an effective magnetic moment per atom.

• Research Organization: Physics Department, Brookhaven National Laboratory, Upton, New York 11973
• OSTI ID: 6014377
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 31:5; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ANTIFERROMAGNETISM
BCC LATTICES
CHROMIUM
COHERENT SCATTERING
COLLECTIVE EXCITATIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DATA
DIFFRACTION
DOMAIN STRUCTURE
ELEMENTS
ENERGY DEPENDENCE
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXPERIMENTAL DATA
HIGH TEMPERATURE
INFORMATION
LOW TEMPERATURE
MAGNETIC FIELDS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETISM
MEDIUM TEMPERATURE
METALS
NEUTRON DIFFRACTION
NUMERICAL DATA
PHYSICAL PROPERTIES
SCATTERING
SPIN FLIP
SPIN WAVES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS