Magnetotransport Mechanisms in Strongly Underdoped YBa2Cu3Ox Single Crystals
Abstract
We report magnetoresistivity measurements on strongly underdoped YBa2Cu3Ox (x=6.25, 6.36) single crystals in applied magnetic fields H || c-axis. We identify two different contributions to both in-plane and out-of-plane magnetoresistivities. The first contribution has the same sign as the temperature coefficient of the resistivity ∂ ln(i)/∂ T (i=c,ab). This contribution reflects the incoherent nature of the out-of-plane transport. The second contribution is positive, quadratic in field, with an onset temperature that correlates to the antiferromagnetic ordering.
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