Conduction-electron-spin relaxation in sodium has been measured in the liquid-hydrogen-temperature range 14-20 K. We believe we have successfully separated the contributions to the measured relaxation rate from the impurity, surface, and electron-phonon (intrinsic) mechanisms by working with samples of controlled geometry at low rf frequency (10 MHz). The temperature dependence of the intrinsic relaxation time agrees reasonably well with the Debye-model calculations of Yafet. In our samples the probability of relaxation per surface collision for an electron spin is on the order of 10 '.
The Comments and Addenda section is for short communications which are not of such urgency as to justify publication in Physical Retie+ or Physical Review@ Letters, in which the additional information can be presented without the need for uniting a complete article. &vill foQom the same publication schedule as articles in this journal, and galleys mill be sent to authors.Surface relaxation~as improperly treated in a previous paper by %'ang and Schumacher. The treatment is corrected here, and the data are replotted. The correction leaves unchanged our measured values of T, in the temperature range 14-20 K, but changes our estimate of surface-relaxation probability per electron-surface collision from 10 ' to on the order of 10 '.
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