Magnetoresistance in Heavily Underdoped YBa_2Cu_3O_{6+x}: Antiferromagnetic Correlations and Normal-State Transport

Abstract

We report on a contrasting behavior of the in-plane and out-of-plane magnetoresistance (MR) in heavily underdoped antiferromagnetic (AF) YBa_2Cu_3O_{6+x} (x<0.37). The out-of-plane MR (I//c) is positive over most of the temperature range and shows a sharp increase, by about two orders of magnitude, upon cooling through the Neel temperature T_N. A contribution associated with the AF correlations is found to dominate the out-of-plane MR behavior for H//c from far above T_N, pointing to the key role of spin fluctuations in the out-of-plane transport. In contrast, the transverse in-plane MR (I//a(b);H//c) appears to be small and smooth through T_N, implying that the development of the AF order has little effect on the in-plane resistivity.

arXiv comment4 pages, 5 figures, accepted for publication in Phys.Rev.Lett

References in corpus (3)

• Spin-Gap Proximity Effect Mechanism of High Temperature Superconductivity
• A Theory of the Longitudinal and Hall Conductivities of the Cuprate Superconductors
• Normal-state resistivity anisotropy in underdoped RBa_2Cu_3O_{6+x} crystals

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