Residual Resistivity Measurements on High RRR Aluminum by the Eddy Current Decay Method
Measurements of resistivity at 4.2 K by the eddy current decay (ECD) method on high RRR aluminum reveal that the ECD primary coil field level may influence results. Measurements are reported for magnetic flux densities of 40 to 400 gauss, on large polycrystalline specimens with nominal RRR values of 5000 and 10,000 as well as on large 15,000-20,000 RRR single crystal specimens. The true “zero-field” resistivity (p“) is determined by extrapolation. A graphical method for determining approximate po values from one measurement of resistivity is presented along with a listing of approximate errors for resistivity measurements at various field levels.
KeywordsFlux Density Pure Aluminum Residual Resistivity Field Level Secondary Coil
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