Effect of electron irradiation on the fluctuation conductivity in YBa2Cu3O7\u2212\u03b4 single crystals

G Ya Khadzhai,A Chroneos,S F Zdorovko,R V Vovk,I L Goulatis,Yu V Litvinov

doi:10.1007/s10854-018-8768-y

Abstract

In this work, the evolution of the excess conductivity of the YВа2Сu3О7−δ single crystals under electron irradiation is studied. It is shown that irradiation with electrons leads to a significant expansion of the temperature interval that excess conductivity exists. Therefore, the value of the transverse coherence length ξс(0) increases by a factor of 1.4 and the point of the 2D–3D crossover shifts with respect to the temperature.

Highlights

IntroductionThe question of the effect of dimensionality on the formation of the superconducting state in high-temperature superconducting cuprates (HTSC) remains open, despite the intense experimental and theoretical studies carried out in the last 30 years [1,2,3]
The question of the effect of dimensionality on the formation of the superconducting state in high-temperature superconducting cuprates (HTSC) remains open, despite the intense experimental and theoretical studies carried out in the last 30 years [1,2,3]. As it is established [1, 4], the large penetration depth, the short coherence length and the layered structure contribute to the appearance of an anomalously wide region of excess conductivity (Δσ) in HTSC compounds in the ρab(T) dependences
Far from the critical temperature (Tc) at Тс ≤ Т < Т* (where T* is the temperature that the deviation from the linear in the ρab(T) dependence commences), Δσ is determined by the so-called pseudogap anomaly (PG) [5,6,7], which was previously studied in detail [8]

Summary

Introduction

The question of the effect of dimensionality on the formation of the superconducting state in high-temperature superconducting cuprates (HTSC) remains open, despite the intense experimental and theoretical studies carried out in the last 30 years [1,2,3] As it is established [1, 4], the large penetration depth, the short coherence length and the layered structure contribute to the appearance of an anomalously wide region of excess conductivity (Δσ) in HTSC compounds in the ρab(T) dependences (in the basal plane). Despite the large number of investigations of the influence of external impact on the fluctuation conductivity in HTSC, there is practically no regarding the effect of irradiation on FC The latter, can significantly change both the absolute value of the electrical resistivity ρ and the nature of its temperature dependences ρ(T) [24]. The choice of the latter as an object of investigation was due to its high critical temperature Тс ≈ 90 K [25] exceeding the boiling point of liquid nitrogen and the greater possibilities for varying its conductive characteristics by doping with substitute elements [26, 27] or by varying the degree of deviation from oxygen stoichiometry [28, 29]

Experimental techniques

Results and discussion

Conclusions