Spin-wave and critical scattering of neutrons from cobalt disulfide

Conference · Tue Dec 31 23:00:00 EST 1974

OSTI ID:4073950

Iizumi, M; Lynn, J W; Ohsawa, A; Ito, H

The triple-axis neutron scattering technique has been used to measure the temperature dependence of the spin-wave and critical scattering below T/sub c/ (=120$sup 0$K) in the metallic ferromagnet CoS$sub 2$. The spin-wave dispersion relations at small propagation vectors (vertical bar q vertical bar less than or equal to 0.3A$sup -1$) can be described by dirac constant $omega$ = Dq$sup 2$- Eq$sup 4$ with D of about 110 MeV-A$sup 2$ and E/D of 1 approximately 2A$sup 2$ at 78$sup 0$K, with a small anisotropy observed in the different symmetry directions of the crystal. At small q, D is found to renormalize as (1-T/T/sub c/ )/sup/$beta$/ with $beta$ = 0.24. Some indication of a triple-peaked structure in the scattering spectrum was observed immediately below T/sub c/. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y. (USA)
• NSA Number: NSA-33-015170
• OSTI ID: 4073950
• Report Number(s): BNL--20600; CONF-751209--17
• Country of Publication: United States
• Language: English

Related Subjects

*COBALT SULFIDES-- SPIN WAVES
360204* --Materials--Ceramics
Cermets & Refractories-- Physical Properties
CRITICAL TEMPERATURE
DISPERSION RELATIONS
FERROMAGNETIC MATERIALS
LOW TEMPERATURE
N50130* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
NEUTRONS
SCATTERING
TEMPERATURE DEPENDENCE