In situ comparison of the critical current density in $YB{a}_{2}C{u}_3{O}_{7-\delta }$ thin films measured by the screening technique under two criteria

Abstract

In this investigation we report the determination of the critical current density $J_c$ flowing in a $\mathrm{Y}{\mathrm{Ba}}_2{\mathrm{Cu}}_3{\mathrm{O}}_{7-\delta }$ superconducting thin film. Estimation of $J_c$ was carried out by an inductive technique, the so-called screening technique, in which both the imaginary part of the fundamental harmonic of susceptibility ${\chi }_1^{\prime \prime }$ and third harmonic voltage $V_3$ criteria were considered for the determination of the full penetration field. In order to verify the reliability of this technique under two criteria, we investigated the homogeneity of $J_c$ via transport measurements conducted on four microbridges patterned in the same film. Based on the transport method we found that both techniques yield similar results in the determination of $J_c$ for temperatures close to critical temperature $T_c$. However, at temperatures relatively far from $T_c$, the $V_3$ criterion showed a better agreement with the transport data. Furthermore, using both criteria, we propose a methodology to estimate in situ the coil factor associated with the $V_3$ criterion, avoiding in this way the need of implementing an additional technique.

6 figures, 10 pages

References in corpus (3)

• The Flux-Line Lattice in Superconductors
• Critical current density and ac harmonic voltage generation in $YB{a}_{2}C{u}_3{O}_{7-\delta }$ thin films by the screening technique
• Study of higher-order harmonics of complex ac susceptibility in $Y{B}_2{C}_3{O}_{7-\delta }$ thin films by the mutual inductive method

Cited by in corpus (1)

• Design and construction of a desktop AC susceptometer using an Arduino and a Bluetooth for serial interface