Magnetotransport properties of antiferromagnetic YBa 2Cu 3O 6.25 single crystals

• Published in: Physica. C, Superconductivity Vol. 364; pp. 399 - 403
• Main Authors: Cimpoiasu, E, Paulikas, A.P, Veal, B.W, Almasan, C.C
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2001
• Subjects: Antiferromagnetism; High- Tc cuprates; Magnetoresistance; Antiferromagnetism; 74.72; 74.70; High- T c cuprates; 75.50.E; Magnetoresistance
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/S0921-4534(01)00806-1

In-plane Δρ ab / ρ ab and out-of-plane Δρ c / ρ c magnetoresistivities of antiferromagnetic YBa 2Cu 3O 6.25 single crystals were measured in magnetic fields H applied along the ab-plane. Δρ ab / ρ ab is a superposition of two components: The first component is strongly in-plane anisotropic, changing sign from negative when H∥ I to positive when H⊥ I. The second component is positive, quadratic in H, and isotropic in the ab-plane. Δρ c / ρ c displays a fourfold symmetry upon in-plane rotation of the magnetic field, with maxima along the easy axes of antiferromagnetic spin ordering and minima along unfavorable directions of spin orientation (45° from the Cu–O–Cu bonds).