Weakening thickness dependence of critical current density in $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}x}$ films using nanotube pore insertion

Weakening thickness dependence of critical current density in $Y {Ba}_{2} {Cu}_{3} O_{7 - x}$ films using nanotube pore insertion

Xiang Wang, Alan Dibos, and J. Z. Wu

Phys. Rev. B 77, 144525 – Published 29 April 2008

Abstract

$Y {Ba}_{2} {Cu}_{3} O_{7 - x}$ films with nanotube pores (YBCO/NTPs) aligned along normal of the film have been fabricated with thickness ranging from $0.1 to 1.2 μ m$ . When compared to YBCO films without NTPs, YBCO/NTP samples show much reduced thickness dependence of the critical current density $J_{c}$ , in addition to the overall higher $J_{c}$ values, in magnetic fields below the matching field of the NTPs. These results suggest that the through-thickness NTPs may provide an enhanced pinning force per vortex length $(F_{p})$ which remains a constant at various thicknesses.