Magnetotransport Mechanisms in Strongly Underdoped YBa_2Cu_3O_x Single Crystals
arXiv:cond-mat/0109489 · doi:10.1103/PhysRevB.64.104514
Abstract
We report magnetoresistivity measurements on strongly underdoped YBa_2Cu_3O_x (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 \partial ln(Ï_i)/\partial 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.
4 pages, 3 figures