Effect of transverse magnetic field on the excess conductivity of monodomain YBa2Cu3O7-δ   single crystals

K. A. Kotvitskaya Physics Department, V. Karazin Kharkiv National University, Svobody Sq. 4, 61077 Kharkiv, Ukraine Ukrainian State Academy of Railway Transport, Feyerbaha Sq. 7, 61050 Kharkiv, Ukraine
K. V. Tiutierieva Physics Department, V. Karazin Kharkiv National University, Svobody Sq. 4, 61077 Kharkiv, Ukraine
S. V. Savich Physics Department, V. Karazin Kharkiv National University, Svobody Sq. 4, 61077 Kharkiv, Ukraine
V. V. Sklyar Physics Department, V. Karazin Kharkiv National University, Svobody Sq. 4, 61077 Kharkiv, Ukraine
R. V. Vovk Physics Department, V. Karazin Kharkiv National University, Svobody Sq. 4, 61077 Kharkiv, Ukraine

Keywords: excess conductivity, YBa2Cu3O7-δ single crystals, oxygen deficiency, pinning, 2D-3D crossover, intrinsic pinning

Abstract

In present work the influence of a transverse on the temperature dependence of the excess conductivity in the temperature interval of the transition to the superconducting state in untwinned YBa₂Cu₃O_7-_δsingle crystals with optimal oxygen content are investigated. Causes of low-temperature “tails” (paracoherent transitions) in the resistive transitions in superconducting state are analyzed in the framework of the implementation of the various regimes of the phase state of vortex matter.

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