Magnetotransport Mechanisms in Strongly Underdoped YBa2Cu3Ox Single Crystals
E. Cimpoiasu, G. A. Levin, C. C. Almasan, A. P. Paulikas, B. W. Veal
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(ρi)/∂ 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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