Magnetic disorder resistivities of heavy rare earth alloys

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Abstract
Magnetic disorder resistivities have been measured for polycrystalline gadolinium, dysprosium and erbium metals with yttrium. The results are interpreted using Dekker's model (1964) which gives an effective mass ratio alpha for the Gd-Yt alloy system which in concentration independent at 2.6+or-0.2. The exchange coupling constant J for the Gd-Yt alloy system is concentration dependent and varies from 2.9+or-0.1 eV AA3 to 3.3+or-0.1 eV AA3 for alloys containing less than 35% Gd. The corresponding values of alpha for the dyprosium and erbium alloys are 3.7+or-0.2 and 4.1+or-0.2. The value of J does not vary significantly within experimental error for the concentrated Dy-Yt and Er-Yt alloys the value being 2.6+or-0.1 eV AA3 and 2.1+or-0.1 eV AA3 respectively. Differences in the observed and calculated Nordheim coefficients are also discussed.

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