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 with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>g</mml:mi></mml:math>Anisotropy

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.