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Magnetoresistance Anomalies in Antiferromagnetic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>YBa</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi /></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi>Cu</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi /></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi /></mml:mrow><mml:mrow><mml:mn>6</mml…
We report novel features in the in-plane magnetoresistance (MR) of heavily underdoped YBa_2Cu_3O_{6+x}, which unveil a developed ``charged stripe'' structure in this system. One of the striking features is an anisotropy of the MR with a "d-wave" symmetry upon rotating the magnetic field H within the ab plane, which is …