Abstract
We study theoretically the fluctuation-induced electric conductivity in a magnetic field in the clean limit. Then we analyze the magnetoresistance observed in single-crystal Y-Ba-Cu-O samples. The present theory describes the observed magnetoresistance as well as the earlier dirty-limit theory by Aronov {ital et} {ital al}. (Phys. Rev. Lett. 62, 965 (1989)) but the value of the phase-relaxation time {tau}{sub {phi}} is two times larger than the one deduced within the dirty-limit theory.
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