Accession Number : AD0722818

Title :   Electron Spin Resonance in Dilute Magnetic Alloys.

Descriptive Note : Technical conference paper,

Corporate Author : CALIFORNIA UNIV LOS ANGELES DEPT OF PHYSICS

Personal Author(s) : Orbach,R.

Report Date : AUG 1970

Pagination or Media Count : 26

Abstract : A summary is given of the theory of electron paramagnetic resonance (ESR) in dilute magnetic alloys. The conditions for the existence of the so-called ESR 'bottleneck' are precisely stated. The frequency and temperature dependent exchange relaxation rates between the localized and conduction electron spins are exhibited. It is shown that, at very low temperatures, the frequency dependence of these rates can be used to 'break the bottleneck' on the low frequency side of the resonance line. This allows for a direct measurement of the exchange coupling in alloys which, at usual helium temperatures, would be strongly bottlenecked and not exhibit exchange widths or shifts. The effect of the ESR bottleneck on the hyperfine splitting of a localized moment in a metal is also discussed. (Author)

Descriptors :   (*ELECTRON PARAMAGNETIC RESONANCE, MAGNETIC ALLOYS), (*PARAMAGNETIC RESONANCE, MAGNETIC ALLOYS), HYPERFINE STRUCTURE, NUCLEAR SPINS, ZEEMAN EFFECT, EQUATIONS OF MOTION, COPPER ALLOYS, MANGANESE ALLOYS, CRYOGENICS

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE