Anomalous rf magnetoresistance in copper at 4 K

Rogers, J. T.; De Panfilis, S.; Melissinos, A. C.; Moskowitz, B. E.; Semertzidis, Y. K.; Wuensch, W. U.; Halama, H. J.; Prodell, A. G.; Fowler, W. B.; Nezrick, F. A.
June 1988
Applied Physics Letters;6/27/1988, Vol. 52 Issue 26, p2266
Academic Journal
We have measured the effect of a magnetic field on the surface resistance of polycrystalline Cu at f=1.2 GHz and at 4.4 K; under these conditions the surface resistance is well into the anomalous skin effect regime but has not reached its limiting value. We find that the transverse and longitudinal magnetoresistance are an order of magnitude smaller than the dc magnetoresistance and depend quadratically on the field. At low fields we observe a decrease in surface resistance with increasing field which can be interpreted as a size effect of the rf surface current, but is also typical of superconductors.


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