MAGNETORESISTANCE OF YBA2CU3-ZALZO7-Δ SINGLE CRYSTALS WITH A SYSTEM OF UNIDIRECT PLANAR DEFECTS

  • V. Yu. Gres’ V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine https://orcid.org/0000-0002-2085-8042
  • M. V. Korobkov V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine
  • L. O. Pashchenko V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine https://orcid.org/0009-0006-3620-2749
  • O. Yu. Vragov V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine https://orcid.org/0009-0006-0913-9035
  • A. O. Komisarov V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine
  • V. O. Kovrygin V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine
  • M. M. Inozemtsev V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine https://orcid.org/0009-0002-6414-7776
  • O. G. Chepurin V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine https://orcid.org/0009-0000-4055-5113
  • D. F. Yarchuk V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine https://orcid.org/0009-0009-6746-1315
  • G. Ya. Hadzhai V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine https://orcid.org/0000-0002-1257-8702
  • V. F. Korshak V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine https://orcid.org/0000-0001-5957-3186
  • R. V. Vovk V. N. Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine https://orcid.org/0000-0002-9008-6252
DOI: https://doi.org/10.26565/2222-5617-2025-42-03
Keywords: YBa2Cu3O7-δ single crystals, excess conductivity, pinning, magnetoresistance, twin boundaries, crossover

Abstract

The work carried out electroresistive studies under the influence of a constant magnetic field up to 12.7 kOe at the orientation of the magnetic field vector Н ^ с and Н || с on different conductivity regimes of single crystals                 YBa2Cu3-zAlzO7-δ (z ≤ 0.5) with a unidirectional system of twin boundaries (TB) at the geometry of the flow of the transport current I || TB, when the influence of twins on the processes of scattering of current carriers is minimized. It was established that twin boundaries in single crystals YBa2Cu3-zAlzO7-δ (z ≤ 0.5) are effective centers of fluctuation carriers. The deviation from linearity of the dependences of the specific electrical resistance in the base ab-plane ρab(Т) at a temperature T in the interval Tс < T < 1.35 Tс can be satisfactorily explained within the framework of the theory of fluctuation superconductivity. At the same time, in the immediate vicinity of the critical temperature Tc, the fluctuation conductivity (FC) is well described by the three-dimensional Aslamazov – Larkin model. The application of a magnetic field leads to a significant narrowing of the temperature interval of the existence of three-dimensional superconducting fluctuations. The non-monotonic dependence of the coherence length along the c axis at T → 0 xс(0) on the magnetic field can probably be associated with the suppression of the excess fluctuation conductivity in the region of weak magnetic fields. The absence of the “fan-shaped” expansion of resistive transitions in the magnetic field, characteristic of impurity-free YBa2Cu3-zAlzO7-δ samples, is due to the suppression of the phase transition to the state of an unpinned vortex liquid due to the enhancement of the pinning of the vortex lattice at the twin boundaries.

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Published
2025-05-28
How to Cite
Gres’, V. Y., Korobkov, M. V., Pashchenko, L. O., Vragov, O. Y., Komisarov, A. O., Kovrygin, V. O., Inozemtsev, M. M., Chepurin, O. G., Yarchuk, D. F., Hadzhai, G. Y., Korshak, V. F., & Vovk, R. V. (2025). MAGNETORESISTANCE OF YBA2CU3-ZALZO7-Δ SINGLE CRYSTALS WITH A SYSTEM OF UNIDIRECT PLANAR DEFECTS . Journal of V. N. Karazin Kharkiv National University. Series Physics, (42), 27-36. https://doi.org/10.26565/2222-5617-2025-42-03
Issue
No. 42 (2025): Journal of V. N. Karazin Kharkiv National University. Series Physics
Section
Articles

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