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Eddy current measurements on ultrapure molybdenum and rhenium

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2 Author(s)
Riherd, M.C. ; Physics Department, Rice University, Houston, Texas 77001 ; Schreiber, R.

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An extension of the well-known eddy current method for measuring the resistivity ρ of low-resistivity specimens is described. The induced voltage in a pickup coil around a cylindrical sample is given, for a sudden field change, as V(t)∝∑n=1exp[-λn2α(ρ)t]. The usual procedure requires the measurement of V(t) for values of the time t such that only the first term in the sum need be considered. For low-resistivity metals, this method requires a long observation time (several seconds) and a low-noise high-gain amplifier. By including the first M terms in this expansion, the amplifier requirements and the observation time may be reduced. Resistivity data with an estimated error of less than 5% have been obtained for several ultrapure samples of Mo and Re at 4.2 K.

Published in:

Journal of Applied Physics  (Volume:44 ,  Issue: 11 )

Date of Publication:

Nov 1973

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