Composition variation and electron irradiation effects on the fluctuation conductivity in Y1–zPrzBa2Cu3O7−δ single crystals

A. Chroneos; D. D. Kolesnikov; I. A. Taranova; A. V. Matsepulin; R. V. Vovk

doi:10.1007/s10854-020-04476-3

Composition variation and electron irradiation effects on the fluctuation conductivity in Y_1–zPr_zBa₂Cu₃O_7−δ single crystals

A. Chroneos, D. D. Kolesnikov, I. A. Taranova, A. V. Matsepulin, R. V. Vovk

Faculty of Engineering, Environment & Computing

Research output: Contribution to journal › Article › peer-review

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Abstract

A comparative analysis of the changes in the fluctuation conductivity and characteristics of the superconducting state of YBa₂Cu₃O_7–δ single crystals caused by various types of defects is carried out. These defects appeared due to irradiation with high-energy electrons (radiation doses from 1.4 to 8.8 10¹⁸ cm^–2), changes in oxygen deficiency (0.08 ≤ δ ≤ 0.23) due to annealing at different temperatures, or doping with praseodymium (Y_1–zPr_zBa₂Cu₃O_7−δ, 0 ≤ z ≤ 0.5 at optimal oxygen concentration). It is shown that the introduction of such defects leads to a significant expansion of the temperature range of the existence of excess conductivity, and upon doping with praseodymium, it also leads to the appearance of a thermally activated deflection on the temperature dependence of the electrical resistance. The effect of such defects on the superconducting transition temperature, T_c, and the coherence length along the c axis, ξ_c(0), is studied. In particular, ξ_c(0) more than quadruples (at z = 0.43), while the 2D-3D crossover point shifts towards higher temperatures. Possible reasons for the suppression of superconductivity in YBa₂Cu₃O_7–δ upon irradiation with fast electrons and the qualitatively different temperature dependences of its resistivity in the basal plane, ρ_ab (T), are discussed.

Original language	English
Pages (from-to)	19429-19436
Number of pages	8
Journal	Journal of Materials Science: Materials in Electronics
Volume	31
Issue number	21
DOIs	https://doi.org/10.1007/s10854-020-04476-3
Publication status	Published - 30 Sep 2020

Bibliographical note

This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Electrical and Electronic Engineering

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Composition variation and electron irradiation effects on the fluctuation conductivity in Y_1–zPr_zBa₂Cu₃O_7−δ single crystals. / Chroneos, A.; Kolesnikov, D. D.; Taranova, I. A.; Matsepulin, A. V.; Vovk, R. V.

In: Journal of Materials Science: Materials in Electronics, Vol. 31, No. 21, 30.09.2020, p. 19429-19436.

Research output: Contribution to journal › Article › peer-review

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abstract = "A comparative analysis of the changes in the fluctuation conductivity and characteristics of the superconducting state of YBa2Cu3O7–δ single crystals caused by various types of defects is carried out. These defects appeared due to irradiation with high-energy electrons (radiation doses from 1.4 to 8.8 1018 cm–2), changes in oxygen deficiency (0.08 ≤ δ ≤ 0.23) due to annealing at different temperatures, or doping with praseodymium (Y1–zPrzBa2Cu3O7−δ, 0 ≤ z ≤ 0.5 at optimal oxygen concentration). It is shown that the introduction of such defects leads to a significant expansion of the temperature range of the existence of excess conductivity, and upon doping with praseodymium, it also leads to the appearance of a thermally activated deflection on the temperature dependence of the electrical resistance. The effect of such defects on the superconducting transition temperature, Tc, and the coherence length along the c axis, ξc(0), is studied. In particular, ξc(0) more than quadruples (at z = 0.43), while the 2D-3D crossover point shifts towards higher temperatures. Possible reasons for the suppression of superconductivity in YBa2Cu3O7–δ upon irradiation with fast electrons and the qualitatively different temperature dependences of its resistivity in the basal plane, ρab (T), are discussed.",

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