Abstract

We have used optical spin orientation techniques to measure T 1 of conduction electrons in GaAs ( NinA ≈ 10 17 cm -3) for 4.7 K ⩽ T ⩽ 200 K. From Hall effect measurements we estimated the electron momentum relaxation time τ p . For 50 K ⩽ T ⩽ 200 K, the product T 1τ p agrees with our earlier order of magnitude estimate of the D'yakonov-Perel' mechanism, in which band structure induced precession is strongly narrowed by momentum relaxation. The Elliott mechanism is one to two orders of magnitude weaker.

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