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Título: The concentration dependence of paramagnetic relaxation in dilute potassium chromi- and ferri-cyanides at liquid helium temperature.
Autores: Vanier, Jacques P.
Fecha: 1961
June 14, 2013.
Publicador: McGill University - MCGILL
Fuente:
Tipo: Postprint
Tema: Physics
Descripción: Measurements of the spin-spin relaxation time and of the effective, lattice-induced, transition probabilities are reported for magnetically dilute potassium chromicyanide in chemically analyzed concentrations ranging nfrom 0.06 to 1.5%. In these measurements the c-axis of the cobalticyanide matrix was parallel to the static magnetic field. All measurements were maede at a temperature of 4.2oK. Measurements made at a concentration of 1.5% did not fit into the same pattern as measuremetns made at lower concentrations, suggesting a change in the dominant mechanism of relaxation. Pulse and saturation measurements have been compared. The effective, lattice-induced transition probability by the pulse method for samples in the lower range of concentration was found to be independent of the concentration and of the transition involved was found to have a value of W = 65±7 sec-1. The results for potassium ferricyanide were much less reliable and only two concentrations, 0.2 and 0.4% have been examined. The static magnetic field was parallel to the b-axis and the temperature was 4.2oK. The value of W is probably between 1000 and 2000 sec-1.
Idioma: eng