Influence of electron irradiation on fluctuation conductivity and pseudogap in $YB{a}_{2}C{u}_3{O}_{7-\delta }$ single crystals

Abstract

The effect of electron irradiation with the energy of 2.5 MeV on the temperature dependences of the resistivity of an optimally doped $YB{a}_{2}C{u}_3{O}_{7-\delta }$ single crystal has been studied. The temperature dependences of both fluctuation conductivity ${\sigma }^{\prime }(T)$ and the pseudogap ${\Delta }^{\ast }(T)$ on irradiation dose $\varphi$ have been calculated within the local pair model. Here we show that with an increase in $\varphi$, the value of $\rho (300K)$ increases linearly, while $T_c$ decreases linearly. Concurrently, the value of $\rho 100K$ increases nonlinearly, demonstrating a feature for ${\varphi }_3$ = 4.3 10${}^{18}$ e/$c{m}^2$, which is also observed in the number of other dose-dependent parameters.Regardless of the irradiation dose, in the temperature range from $T_c$ up to $T_{01}$, ${\sigma }^{\prime }(T)$ obeys the classical fluctuation theories of Aslamazov$-$Larkin and Maki$-$Thompson, demonstrating 3D$-$2D crossover with increasing temperature. The crossover temperature $T_0$ makes it possible to determine the coherence length along the $c$-axis, ${\xi }_c(T)$, which increases by $\approx 3$ times under irradiation. Furthermore, the range of superconducting fluctuations above $T_c$ also noticeably increases.At $\varphi$ = 0, the dependence ${\Delta }^{\ast }(T)$ typical for single crystals containing pronounced twin boundaries is observed with a maximum at $T_{pair}$ ~ 120 K and a distinct minimum at $T=T_{01}$. It was determined for the first time that at ${\varphi }_3$ = 4.3 10${}^{18}$ the shape of ${\Delta }^{\ast }(T)$ changes strongly and becomes the same as in optimally doped $YB{a}_{2}C{u}_3{O}_{7-\delta }$ single crystals with a very low pseudogap opening temperature $T^{\ast }$ and noticeably reduced $T_{pair}$, while at $T_c(\varphi )$ there are no singularities.

16 pages, 10 figures, 3 table

References in corpus (6)

• Pseudogap from ARPES experiment: three gaps in cuprates and topological superconductivity
• Giant superconducting fluctuations in the compensated semimetal FeSe at the BCS-BEC crossover
• Superconducting Fluctuations, Pseudogap and Phase Diagram in Cuprates
• Linking the pseudo-gap in the cuprates with local symmetry breaking: a commentary
• Effect of electron irradiation and Pr doping on the charge transport in YBCO single crystals
• Investigation of Precursor Superconducting State in YBa${}_2$Cu${}_3$O${}_{7-\delta }$ through In-plane Optical Spectroscopy

Cited by in corpus (2)

• Influence of strong electron irradiation on fluctuation conductivity and pseudogap in YBa${}_2$Cu${}_3$O${}_7$--$\delta$ single crystals
• Evolution of the pseudogap and excess conductivity of YBa${}_2$Cu${}_3$O${}_{7-\delta }$ single crystals in the course of long-term aging