Anisotropic Magnetoresistance in Lightly Doped La_{2-x}Sr_{x}CuO_{4}: Impact of Anti-Phase Domain Boundaries on the Electron Transport

摘要

Detailed behavior of the magnetoresistance (MR) is studied in lightly dopedantiferromagnetic La_{1.99}Sr_{0.01}CuO_{4}, where, thanks to the weakferromagnetic moment due to spin canting, the antiferromagnetic (AF) domainstructure can be manipulated by the magnetic field. The MR behaviordemonstrates that CuO_2 planes indeed contain anti-phase AF domain boundariesin which charges are confined, forming anti-phase stripes. The data suggestthat a high magnetic field turns the anti-phase stripes into in-phase stripes,and the latter appear to give better conduction than the former, whichchallenges the notion that the anti-phase character of stripes facilitatescharge motion.