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Number of results
2012 | 121 | 5-6 | 1191-1194

Article title

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

Content

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Languages of publication

EN

Abstracts

EN
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.

Keywords

EN

Year

Volume

121

Issue

5-6

Pages

1191-1194

Physical description

Dates

published
2012-05

Contributors

author
  • Kharkov National University, 4 Svoboda Sq., 61077 Kharkov, Ukraine
author
  • Kharkov National University, 4 Svoboda Sq., 61077 Kharkov, Ukraine
author
  • Kharkov National University, 4 Svoboda Sq., 61077 Kharkov, Ukraine
author
  • Kharkov National University, 4 Svoboda Sq., 61077 Kharkov, Ukraine
author
  • University of Exeter, Stocker Road, Exeter, EX4 4QL, United Kingdom

References

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Document Type

Publication order reference

Identifiers

YADDA identifier

bwmeta1.element.bwnjournal-article-appv121n5-6p61kz
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