THE MAGNETIC FIELD DEPENDENCE OF PARAMAGNETIC RELAXATION IN A KRAMERS SALT AT LOW TEMPERATURES.
Abstract
Paramagnetic relaxation rates were measured for iron in dilute potassium ferricyanide at liquid helium temperatures and over a range of static magnetic field strengths covering approximately 1.1-3.6 kilogauss. The relaxation rates were measured by observing the transient behavior of a paramagnetic resonance line following inversion by adiabatic rapid passage. For the conditions under which this experiment was performed, a review of the Kronig-Van Vleck theory of single phonon, or direct, relaxation was shown to yield: 1/T sub 1D = const. (applied mag. field to the 4th power)T. In analyzing the experimental data, the direct relaxation rate was separated from the observed relaxation rate by subtracting the Raman term observed by previous researchers. The results for all but the highest field value showed good agreement with the predicted fourth-power field dependence. At the highest value of the field a marked size effect was noted; however, the results of experiments performed with the smallest sample were shown also to give good agreement with the theory. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1964
- Accession Number
- AD0600076
Entities
People
- D. A. Davids
Organizations
- Johns Hopkins University