Excitations of the spin density wave in pure chromium

Journal Article · Fri Jan 01 04:00:00 EST 1982 · AIP Conf. Proc.; (United States)

DOI:https://doi.org/10.1063/1.33687· OSTI ID:6490582

Werner, S A; Shirane, G; Fincher, C R; Grier, B H

This paper summarizes recent investigations of the magnetic excitations of the spin density wave (SDW) in pure Cr in both the low temperature longitudinally polarized phase (T < 122K) and in the higher temperature transversely polarized phase (122K < T < 312K). In both phases we observe spin wave modes of very high velocity originating from the incommensurate Bragg points. In the transversely polarized SDW phase new additional excitations are observed, centered in reciprocal space at the (1,0,0) commensurate point. These excitations are not affected by a magnetic field. Inelastic scattering in the paramagnetic phase above the Neel point (312K) is observed in a reasonably well localized region of reciprocal space near (1,0,0) indicating that there are spin-spin correlations extending over many bcc unit cells and persisting to temperatures at least as high as 1.7 T/sub N/.

• Research Organization: Univ. of Missouri, Columbia
• OSTI ID: 6490582
• Journal Information: AIP Conf. Proc.; (United States), Journal Name: AIP Conf. Proc.; (United States) Vol. 89; ISSN APCPC
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals &amp; Alloys-- Structure &amp; Phase Studies
BARYONS
BRAGG REFLECTION
CHROMIUM
CORRELATIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELEMENTARY PARTICLES
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
HADRONS
LOW TEMPERATURE
MEDIUM TEMPERATURE
METALS
NEUTRONS
NUCLEONS
POLARIZATION
REFLECTION
SCATTERING
SPIN WAVES
TRANSITION ELEMENTS