Paramagnetic spin fluctuations in the weak itinerant-electron ferromagnet MnSi

Journal Article · Wed May 01 04:00:00 EDT 1985 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.31.5884· OSTI ID:5701238

Ishikawa, Y; Noda, Y; Uemura, Y J; Majkrzak, C F; Shirane, G

Paramagnetic spin fluctuations in the weak itinerant-electron ferromagnet MnSi have been measured by using both unpolarized and polarized neutron scattering, and the scattering intensity was put on an absolute value by the simultaneous measurements of phonon cross sections. The magnetic excitation spectra over the whole Brillouin zone, for a wide energy range from 0 to 20 meV (h..omega../kT/sub c/ = 7.9) and up to temperatures (T/T/sub c/ = 10) well above T/sub c/, follow closely the Moriya-Kawabata self-consistent-renormalization theory for the weak itinerant-electron ferromagnet. Based on these experimental results, the origin of the increase in the amplitude of the local magnetic moment above T/sub c/ is attributed to the thermal excitations of the high-energy spin fluctuations in the Stoner continuum.

• Research Organization: Physics Department, Tohoku University, Sendai, 980, Japan
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5701238
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 31:9; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ANGULAR MOMENTUM
COHERENT SCATTERING
DIFFRACTION
FERROMAGNETIC MATERIALS
FLUCTUATIONS
INTERMETALLIC COMPOUNDS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MANGANESE COMPOUNDS
MANGANESE SILICIDES
MATERIALS
NEUTRON DIFFRACTION
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
SCATTERING
SILICIDES
SILICON COMPOUNDS
SPIN
TRANSITION ELEMENT COMPOUNDS
VARIATIONS