Spin fluctuations in EuS above T/sub C/: Comparison with asymptotic renormalization-group theory

Journal Article · Fri Apr 15 04:00:00 EDT 1988 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.340906· OSTI ID:5417852

Boeni, P; Shirane, G; Bohn, H G; Zinn, W

Constant-energy scans in neutron scattering provide a very sensitive tool for testing theoretical line shapes in detail. In order to verify the predictions of asymptotic renormalization-group theory for isotropic ferromagnets above T/sub C/ we measured the temperature dependence of the paramagnetic scattering from the Heisenberg ferromagnet EuS. The width of the constant-E peaks increases with increasing temperature as predicted. Surprisingly the positions do not scale. The nonuniversal behavior is attributed to the crossover from isotropic to dipolar dynamics.

• Research Organization: Brookhaven National Laboratory, Upton, New York 11973
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5417852
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 63:8; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ANGULAR MOMENTUM
CHALCOGENIDES
COHERENT SCATTERING
CRITICAL TEMPERATURE
DIFFRACTION
EUROPIUM COMPOUNDS
EUROPIUM SULFIDES
FERROMAGNETIC MATERIALS
FLUCTUATIONS
GROUP THEORY
INELASTIC SCATTERING
LINE WIDTHS
LOW TEMPERATURE
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MATERIALS
MATHEMATICS
NEUTRON DIFFRACTION
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
SPIN
SULFIDES
SULFUR COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
VARIATIONS
VERY LOW TEMPERATURE