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Critical and paramagnetic spin fluctuations in Heisenberg magnets

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
; ;
The frequency- and wave-vector-dependent spin response function is calculated for a Heisenberg ferromagnet using the mode-coupling theory. Results are presented for the critical and paramagnetic regions. The work is motivated largely by recent, high-resolution neutron spectroscopy studies of EuO and EuS. In view of this, the Heisenberg model used incorporates nearest- and next-nearest-exchange interactions between spins on a face-centered-cubic lattice. The coupled-mode theory is shown to be successful in describing the measurements. Additional features are predicted as possible subjects of future experimental work. We present a review of various derivations of mode-coupling equations and demonstrate the equivalence of some prescriptions. The question of incorporating an external magnetic field in the theory is addressed, and we conclude that readily attainable fields have a minimal effect on the spin dynamics.
Research Organization:
Dipartimento di Fisica dell'Universita di Firenze, Largo E. Fermi 2, 50125 Firenze, Italy
OSTI ID:
6552326
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:4; ISSN PRBMD
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BRILLOUIN ZONES
CHALCOGENIDES
COMPUTERIZED SIMULATION
CRITICAL TEMPERATURE
CRYSTAL LATTICES
CRYSTAL MODELS
CRYSTAL STRUCTURE
CUBIC LATTICES
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
EQUIPMENT
EUROPIUM COMPOUNDS
EUROPIUM OXIDES
EUROPIUM SULFIDES
FCC LATTICES
FERROMAGNETIC MATERIALS
FUNCTIONS
HEISENBERG MODEL
MAGNETIC FIELDS
MAGNETIC MATERIALS
MAGNETISM
MATERIALS
MATHEMATICAL MODELS
NEUTRON SPECTROSCOPY
ORDER-DISORDER TRANSFORMATIONS
OXIDES
OXYGEN COMPOUNDS
PARAMAGNETISM
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
RESPONSE FUNCTIONS
SCALING LAWS
SIMULATION
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
ZONES