Theory of Acoustic Paramagnetic Resonance in Dense Magnetic Insulators

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Abstract
Several mechanisms which describe the interaction between spins and phonons in a dense paramagnetic insulator are theoretically explored in order to estimate their resonant contribution to the ultrasonic attenuation at high temperatures. In particular, one mechanism provides a quasiresonant contribution to the attenuation which is roughly proportional to the square root of the difference of the frequency and certain multiples of the Larmor frequency. Other mechanisms may lead to the same type of line shape.