Paramagnetic resonance absorption of phonons in pink ruby.
Weeks, Grady A.
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The spin-phonon interaction in pink ruby has been studied at 1.4 K by measurement of the absorption spectra for 5,33 gc/s acoustic pulses, EPR spectra were also measured in the 12,4 - 18,0 gc/s band. Both the EPR and acoustic line shapes were found to be essentially Gaussian except for a small, previously unreported asymmetry. The line widths were also measured. The acoustic line width at 1,4 K was found to be 55 mc/s as compared to 90 mc/s for the EPR spectra. In addition, the EPR line width was found to be temperature dependent. A new theoretical model for the calculation of EPR line width contributions from isotropic exchange effects in the high temperature limit for magnetically dilute systems is presented. The calculated line width and the experimental line width agree within a few percent. Precision measurements of the energy level structure were also made for ruby over the temperature range from 1.4 K to 300 degrees K. Significant temperature variation was found, dispite the fact that the previously published energy level structure was given to five figures without indication of temperature variation. The literature values appear to need modification in the second or third figure in some temperature ranges.
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