Theory of magnetoresistance anisotropy in the lamellar underdoped copper oxides - art. no. 064406

The phenomenologic theory of anisotropic magnetoresistance in the underdope d easy-plane antiferromagnets of YBa2Cu3Ox-type is developed. The observed field-induced anisotropy of the magnetoresistance is explained by the macro scopic symmetry of the sample that for low-field value arises from the redi stribution of magnetoelastic antiferromagnetic domains. The field and angul ar dependencies of the resistivity tensor are in satisfactory agreement wit h the available experimental data for the low-field (polydomain) and high-f ield (single-domain) regions.