MAGNETIC RELAXATION IN RARE EARTH SALTS

Experiments have been made on spin-lattice relaxation in rare earth salts in the helium range of temperatures. It is found that at the lowest temperatures, at which relaxation by the 'direct' one-phonon process would be expected to predominate, the relaxation time derived from measurements...

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Bibliographic Details
Main Authors: Cooke,A. H, Daintree,E. J
Format: Report
Language:English
Subjects:
ANISOTROPY
CRYSTAL LATTICES
ELECTRONS
ENERGY
HELIUM
IONS
LOW FREQUENCY
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MEASUREMENT
PHONONS
RARE EARTH COMPOUNDS
RELAXATION TIME
SPINNING(MOTION)
SULFATES
TEMPERATURE
THEORY
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Summary:Experiments have been made on spin-lattice relaxation in rare earth salts in the helium range of temperatures. It is found that at the lowest temperatures, at which relaxation by the 'direct' one-phonon process would be expected to predominate, the relaxation time derived from measurements by the Casimir-Du Pre low frequency method departs in several ways from the predictions of theory, and in particular increases with magnetic field. It is shown that these features can be accounted for if allowance is made for variations of the temperature of the phonons in contact with the spin system, due to a 'phonon bottleneck,' of the type postulated by Scott and Jeffries. (Author)