Magnetoresistance Anomalies in Antiferromagnetic YBa2Cu3O6+x: Fingerprints of Charged Stripes
Yoichi Ando, A. N. Lavrov, Kouji Segawa
Abstract
We report novel features in the in-plane magnetoresistance (MR) of heavily underdoped YBa2Cu3O6+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 caused by the rotation of the stripes with the external field. With decreasing temperature, a hysteresis shows up below ~20 K in the MR curve as a function of H and finally below 10 K the magnetic-field application produces a persistent change in the resistivity. This "memory effect" is caused by the freezing of the directionally-ordered stripes.
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