An investigation i s made of the range of validity of the Kohler rule for the transverse magnetoresistance of aluminium a t 4.6 O K by introducing structural defects with different concentration and configuration by low temperature reactor irradiation and subsequent annealing. -During irradiation the Kohler rule is extremely well satisfied, because in this case only the concentration of identical defects is enlarged. After step-annealing, however, there are large deviations, because the structural defects not only recombine but also rearrange to other configurations, which corresponds to a change in the mean scattering anisotropy. The influence of small angle scattering is to be seen well in the measurement curves.Wir untersuchten den Gultigkeitsbereich der Kohler-Regel fur den transversalen Magnetwiderstand von Aluminium bei 4,6 OK, indem wir Strukturdefekte unterschiedlicher Konzentration und Konfiguration mittels Tieftemperatur-Reaktorbestrahlung und anschliefiendenl Tempern in die Probe einbrachten. Wahrend der Bestrahlung ist die Kohler-Regel ausgezeichnet erfullt, weil in diesem Falle nur die Konzentration von gleichartigen Defekten erhoht wird. Bei der stufenweisen Erholung dagegen ergeben sich starke Abweichungen. weil neben der Rekombination auch Umgruppierungen der Verlagerungsdefekte stattfinden, was einer h d e r u n g der mittleren Streuanisotropie entspricht. Der EinfluB von Kleinwinkelstreuung ist in den MeBknrven gut erkennbar.
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