Observation of a Frequency Dependence in the Conduction-Electron Spin Resonance of Al, Cu, and Ag, Interpreted as a New Many-Body Effect in Metals withgAnisotropy

Abstract
The linewidth and g value for the conduction-electron spin-resonance-transmission line shape of aluminum was observed to be frequency and temperature dependent. The data are interpreted as a consequence of motional narrowing and many-body exchange in metals with g anisotropy, a many-body parameter for the spin part of the Landau correlation function, and the behavior of a relevant relaxation time.