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Magnetoresistance and Intrinsic Pinning of Vortices in the Untwinned YBa_2Cu_3O_{7 - δ} Single Crystals with Optimal Oxygen Content and a Small Deviation from the Oxygen Stoichiometry

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Vovk R., Gvozdikov V., Obolenskii M., Nazyrov Z., Kruglyak V.

Acta Physica Polonica A

2012

vol. 121

issue 5-6

1191-1194

We study the temperature dependence of the in-plane magnetoresistance ρ_{ab}(T) in untwinned YBa_2Cu_3O_{7 - δ} single crystals with the optimal oxygen content and with a small deficit of oxygen atoms at different angles between the external magnetic field 15 kOe and the ab-planes α. We found that at high temperatures in the pseudogap region external magnetic field does not affect the ρ_{ab}(T) but it broadens transitional region T_{c} - T_{c0} from 0.3 K at zero field and α = 0 to approximately 6 K at α = 60° in the field. In case of optimal doping the function ρ_{ab}(T) display a 3D to 2D dimensional crossover when temperature decreases from T_{c} to T_{c0} and scaling near the T_{c0} which we relate to the flux-flow and vortex-lattice melting. In the underdoped sample the vortices are effectively pinned by the random oxygen vacancies and the function ρ_{ab}(T) in transitional region has smooth tails without any traces of crossover and scaling.

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1 Acta Physica Polonica A

1 2012

1 Gvozdikov V.

1 Kruglyak V.

1 Nazyrov Z.

1 Obolenskii M.

1 Vovk R.

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Magnetoresistance and Intrinsic Pinning of Vortices in the Untwinned YBa_2Cu_3O_{7 - δ} Single Crystals with Optimal Oxygen Content and a Small Deviation from the Oxygen Stoichiometry