The Effect of Concentration Gradients of Impurities on the Temperature Dependence of the Spin—Lattice Relaxation Time in Lithium and Beryllium

Measurements are presented of the conduction electron spin resonance linewidths for various samples of lithium and beryllium at frequencies of 9.27 GHz and 33 and 80 MHz, the samples having dimensions which are large compared with the appropriate skin depth. An increase in the linewidths and certain line shape anomalies as measured at 9.27 GHz at low temperatures, are discussed in terms of relaxation in an impure surface layer. A value of χs = 1.6 × 10−7 c.g.s. units has been deduced for the spin susceptibility of beryllium.