Tuning electric charge scattering in YBCO single crystals via irradiation with MeV electrons

Abstract

Irradiation with electrons is an efficient approach to inducing a large number of defects with a minimal impact on the material itself. Analysis of the energy transfer from an accelerated particle smashing into the crystal lattice shows that only electrons with MeV energies produce point defects in the form of interstitial ions and vacancies that form perfect scattering centers. Here, we investigate the changes in the resistive characteristics of YBCO single crystals from the 1-2-3 system after several steps of low-temperature irradiation with $0.5-2.5$\,MeV electrons and irradiation doses of up to $8.8\times 10^{18}$\,cm${}^{-2}$. The penetration depth of such electrons is much larger than the crystal thickness. We reveal that defects appearing in consequence of such electron irradiation not only increase the residual resistance, but they affect the phonon spectrum of the system and lower the superconducting transition temperature linearly with increase of the irradiation dose. Furthermore, the irradiation-induced defects are distributed non-uniformly, that manifests itself via a broadening of the superconducting transition. Interestingly, the excess conductivity remains almost unaffected after such electron irradiation.

5 pages, 3 figures

References in corpus (7)

• Disorder-induced topological change of the superconducting gap structure in iron pnictides
• Disorder, Metal-Insulator crossover and Phase diagram in high-Tc cuprates
• Hydrostatic-pressure effects on the pseudogap in slightly doped YBa2Cu3O7-δ single crystals
• Magnetization reversal assisted by half antivortex states in nanostructured circular cobalt disks
• Hysteretic vortex matching effects in high-$T_c$ superconductors with nanoscale periodic pinning landscapes fabricated by He ion beam projection technique
• Room-temperature annealing effects on the basal-plane resistivity of optimally doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ single crystals
• Effect of electron irradiation and Pr doping on the charge transport in YBCO single crystals

Cited by in corpus (1)

• Angular magnetic-field dependence of vortex matching in pinning lattices fabricated by focused or masked helium ion beam irradiation of superconducting YBa${}_2$Cu${}_3$O${}_{7-\delta }$ thin films