EFFECTS OF HIGHT HYDROSTATIC PRESSURE ON DIFFERENT TYPES OF CONDUCTIVITY OF YBaCuO SINGLE CRYSTALS WITH A GIVEN TOPOLOGY OF PLANAR DEFECTS

  • K. V. Tiutierieva Physics Department, V. Karazin Kharkiv National University Svobody Sq. 4, 61022 Kharkiv, Ukraine
  • Klavdia A. Kotvitskaya Physics Department, V. Karazin Kharkiv National University Svobody Sq. 4, 61022 Kharkiv, UkraineUkrainian State Academy of Railway Transport Feyerbaha Sq. 7, 61050 Kharkiv, Ukraine https://orcid.org/0000-0001-6629-5102
  • A. N. Sokolov Physics Department, V. Karazin Kharkiv National University Svobody Sq. 4, 61022 Kharkiv, Ukraine
  • N. R. Vovk Physics Department, V. Karazin Kharkiv National University Svobody Sq. 4, 61022 Kharkiv, Ukraine
  • R. V. Vovk Physics Department, V. Karazin Kharkiv National University Svobody Sq. 4, 61022 Kharkiv, UkraineUkrainian State Academy of Railway Transport Feyerbaha Sq. 7, 61050 Kharkiv, Ukraine

Abstract

The e ect of high hydrostatic pressures of up to 10 kbar on the basal ab-plane conductivity of YBa2Cu3O7−δ single crystals with unidirectional twin boundaries is investigated. We show that application of a high pressure leads to a substantial decrease of the pressure derivative of the coherence length dξc/dP while increasing dTc/dP and a temperature shift of the 2D-3D crossover point.
Possible mechanisms of the influence of high pressure on the critical temperature and the coherence length are discussed within the frames of a model assuming the presence of singularities in the charge carriers electron spectrum typical for lattices with strong coupling. The excess conductivity Δσ (T) in YBa2Cu3O7−δ has been revealed to obey an exponential dependence in the wide temperature range Tc<T <T*. At this, the description of the excess conductivity by the expression Δσ ~ (1 − T/T*) exp(Δ*ab/T ) can be interpreted in terms of the mean-field theory, where T* is the mean-field superconducting transition temperature and the pseudogap temperature dependence is satisfactory described within the framework of the BCS-BEC crossover theory. An increase of the applied pressure leads to a narrowing of the temperature range of the realization of the pseudogap regime, thereby expanding the linear temperature dependence of the ab-plane resistivity ρ(T).

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Author Biography

R. V. Vovk, Physics Department, V. Karazin Kharkiv National University Svobody Sq. 4, 61022 Kharkiv, UkraineUkrainian State Academy of Railway Transport Feyerbaha Sq. 7, 61050 Kharkiv, Ukraine

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Published
2015-03-25
Cited
How to Cite
Tiutierieva, K. V., Kotvitskaya, K. A., Sokolov, A. N., Vovk, N. R., & Vovk, R. V. (2015). EFFECTS OF HIGHT HYDROSTATIC PRESSURE ON DIFFERENT TYPES OF CONDUCTIVITY OF YBaCuO SINGLE CRYSTALS WITH A GIVEN TOPOLOGY OF PLANAR DEFECTS. East European Journal of Physics, 1(4), 42-48. https://doi.org/10.26565/2312-4334-2014-4-04