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

Conference ·
OSTI ID:5985656
; ; ;
Constant energy scans in neutron scattering provide a very sensitive tool for 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 behaviour is attributed to the crossover from isotropic to dipolar dynamics. 11 refs.
Research Organization:
Brookhaven National Lab., Upton, NY (USA); Kernforschungsanlage Juelich G.m.b.H. (Germany, F.R.). Inst. fuer Festkoerperforschung
DOE Contract Number:
AC02-76CH00016
OSTI ID:
5985656
Report Number(s):
BNL-40220; CONF-871126-1; ON: DE87014911
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CHALCOGENIDES
COHERENT SCATTERING
CRITICAL TEMPERATURE
DIFFRACTION
EUROPIUM 153
EUROPIUM COMPOUNDS
EUROPIUM ISOTOPES
EUROPIUM SULFIDES
FERROMAGNETIC MATERIALS
FLUCTUATIONS
GROUP THEORY
INTERMEDIATE MASS NUCLEI
ISOTOPES
LINE WIDTHS
MAGNETIC FIELDS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MATERIALS
MATHEMATICS
NEUTRON DIFFRACTION
NUCLEI
ODD-EVEN NUCLEI
ORIENTATION
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
RENORMALIZATION
SCATTERING
SPIN ORIENTATION
STABLE ISOTOPES
SULFIDES
SULFUR COMPOUNDS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
VARIATIONS