β Scribed by J.D McClelland
No coin nor oath required. For personal study only.
The susceptibilities of copper and aluminum have been measured as a function of cold work. Spectroscopically-pure samples were cold-worked both by rolling and compression. A Faraday method was used to determine the specific susceptibility and the mass concentration of the ferromagnetic contaminant simultaneously. No changes were noted in either metal. It is pointed out that trace amounts of ferromagnetic impurity accidentally picked up during the cold working process would result in large apparent changes in the observed susceptibility. This might account for the changes reported previously by other workers. L'EFFET DE L'l?CROUISSAGE SUR LA SUSCEPTIBILITI? MAGNBTIQUE DU CUIVRE ET DE L'ALUMINIUM On a mesure les susceptibilites magnetiques du cuivre et de I'aluminium en fonction du degrC d'&rouissage. Des echantillons spectrographiquement purs ont et6 &rouis par laminage et par compression. Une methode de Faraday fut employee pour la dbtermination simultanee de la susceptibilite sp&ifique et de la concentration de I'impuret6 ferromagn&ique. Aucun changement n'a 6th constat dans ces deux m&aux. On souligne le fait que des traces d'impuret& ferromagnCtiques, introduites accidentellement quand on pro&de & l'&rouissage, peuvent provoquer de grands changements apparents dans la susceptibilite observhe. Ceci peut expliquer les changements que d'autres chercheurs ont rapport& antdrieurement. DIE WIRKUNG DER KALTBEARBEITUNG AUF DIE MAGNETISCHE SUSZEPTIBILITPiT VON KUPFER UND ALUMINIUM Die SuszeptibilitPten von Kupfer und Aluminium wurden als Funktion der Kaltbearbeitung gemessen. Spektroskopisch reine Proben wurden durch Walzen und durch Kompression kaltbearbeitet. Mit Hilfe einer Faraday-Methode wurde die spezifische Suszeptibilitat und die Konzentration der ferromagnetischen Verunreinigung gleichzeitig gemessen. In keiner Probe zeigten sich Anderungen. Es wird gezeigt, dass Spuren von w;ihrend der.+Kaltbearbeitung ungewollt aufgenommenen ferromagnetischen Verunreinigungen grosse scheinbare Anderungen in der gemessenen Suszeptibilitit hervorrufen wiirden. Diese Erscheinung mag die von anderen Authoren berichteten Veranderungen erkkiren.
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Copper wires have been cold-worked or subjected to radiation damage. Simultaneous measurements of resistance have been made on a damaged wire and a well-annealed wire. The resistance measurements are made over the temperature range from 4.2"K to 77Β°K. The differing behavior of the temperature-depend
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