NEUTRON INELASTIC SCATTERING MEASUREMENTS OF ANTIFERROMAGNETIC EXCITATIONS IN MnF$sub 2$ AT 4.2 K AND AT TEMPERATURES UP TO THE NEEL POINT
The antiferromagnetic properties of MnF/sub 2/ were studied using a twin- rotor neutron time-of-flight spectrometer. Spin wave dispersion relations were obtained for propagation in the (100) and (001) directions at 4.2 deg K. Decreasing spin wave energies and increasing line widths were observed as the crystal temperature increased from 4.2 to 62.0 deg K. Spin-wave-like fluctuations were observed at 66.3 deg K and just above the Neel point (67.0 deg K) at 68.5 and 70.7 deg K. Spin wave interaction theory described the dispersion fairly well. (auth)
- Research Organization:
- Atomic Energy Research Establishment, Harwell, Berks, Eng.
- NSA Number:
- NSA-18-010091
- OSTI ID:
- 4092064
- Journal Information:
- Phys. Letters, Journal Name: Phys. Letters Vol. Vol: 8
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
ANTIFERROMAGNETISM
CHEMISTRY
CROSS SECTIONS
CRYSTALS
DISPERSION THEORY
ENERGY
ENERGY LEVELS
EXCITATION
FERROMAGNETISM
INELASTIC SCATTERING
INTERACTIONS
LATTICES
LOW TEMPERATURE
MAGNETISM
MANGANESE FLUORIDES
MEASURED VALUES
NEEL TEMPERATURE
NEUTRON SPECTROMETERS
NEUTRONS
NUCLEAR REACTIONS
QUANTUM MECHANICS
RESONANCE
S-MATRIX
SCATTERING
SPIN
TEMPERATURE
TRANSIENTS
USES
VARIATIONS
VELOCITY
CHEMISTRY
CROSS SECTIONS
CRYSTALS
DISPERSION THEORY
ENERGY
ENERGY LEVELS
EXCITATION
FERROMAGNETISM
INELASTIC SCATTERING
INTERACTIONS
LATTICES
LOW TEMPERATURE
MAGNETISM
MANGANESE FLUORIDES
MEASURED VALUES
NEEL TEMPERATURE
NEUTRON SPECTROMETERS
NEUTRONS
NUCLEAR REACTIONS
QUANTUM MECHANICS
RESONANCE
S-MATRIX
SCATTERING
SPIN
TEMPERATURE
TRANSIENTS
USES
VARIATIONS
VELOCITY