Phonon and photon paramagnetic resonance lineshapes in ruby
Crooker, Peter Peirce
Crittenden, E. C., Jr.
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Electron paramagnetic resonance (EPR) and acoustic paramagnetic resonance (APR) lineshapes have been measured for four transitions in ruby at 5.924 GHz. Cr concentrations varying from .005% to 1% were used. Second moments were calculated from the APR lines; half-widths were calculated from both EPR and APR lines. A theory is presented which yields the second moment in terms of sums over exchange and dipole-dipole interactions between Cr pairs. It is shown that the theory predicts moments much larger than measured due to the fact that the stronger Cr-Cr interactions lie outside the observed line. A qualitative calculation of the moment from the known interactions supports this conclusion. Finally, half-widths for both APR and EPR lines are compared and shown to be equal.
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