Phonon and photon paramagnetic resonance lineshapes in ruby

• Main Author: Crooker, Peter Peirce
• Other Authors: Crittenden, E. C., Jr.
• Language: en_US
• Published: Monterey, California. U.S. Naval Postgraduate School 2012
• Online Access: http://hdl.handle.net/10945/12825

Approved for public release, distribution is unlimited. === 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.