Narrowing of the magnetic-resonance line by fluctuations of the exchange interaction in disordered metals
Vodop'yanov B. P., Tagirov L R.
A kinetic equation is derived for the magnetization of localized spins in disordered metals. The exchange interaction is taken into account. If the correlation function of the exchange interaction, ωΙχ = J Σ,</» — </iy)2mp, is larger than the width (δ) of the local-field distribution, the line acquires a Lorentzian shape and a width