Excitations of the spin-density wave in pure chromium

Conference · Wed Dec 31 23:00:00 EST 1980

OSTI ID:6075615

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 spin wave modes of very high velocity are observed 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: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6075615
• Report Number(s): BNL-30084; CONF-810840-6; ON: DE81031972
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals &amp; Alloys-- Structure &amp; Phase Studies
360104* -- Metals &amp; Alloys-- Physical Properties
CHROMIUM
DATA
ELEMENTS
EXPERIMENTAL DATA
FERMI GAS
INFORMATION
LOW TEMPERATURE
MAGNETIC FIELDS
MAGNETIC PROPERTIES
METALS
NEEL TEMPERATURE
NUMERICAL DATA
PHYSICAL PROPERTIES
SPIN WAVES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
WAVE PROPAGATION