Magnetoresistance of Untwinned YBa2Cu3Oy Single Crystals in a Wide Range of Doping: Anomalous Hole-Doping Dependence of the Coherence Length
Abstract
Magnetoresistance (MR) in the a-axis resistivity of untwinned YBa2Cu3Oy single crystals is measured for a wide range of doping (y = 6.45 - 7.0). The y-dependence of the in-plane coherence length ab estimated from the fluctuation magnetoconductance indicates that the superconductivity is anomalously weakened in the 60-K phase; this gives evidence, together with the Hall coefficient and the a-axis thermopower data that suggest the hole doping to be 12% for y = 6.65, that the origin of the 60-K plateau is the 1/8 anomaly. At high temperatures, the normal-state MR data show signatures of the Zeeman effect on the pseudogap in underdoped samples.
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