Spatially-resolved studies of chemical composition, critical temperature, and critical current density of YBaCuO thin film

Details Spatially-resolved studies of chemical composition, critical temperature, and critical current density of YBaCuO thin film Spatially-resolved studies of chemical composition, critical temperature, and critical current density of YBaCuO thin film

1998-06-03

arxiv.org/abs/cond-mat/9806052v3

J. Appl. Phys. v.84(9), 5089-5096 (1998)

Physics

Condensed Matter

Superconductivity

RevTeX, 9 pages with 10 figures; corrected typos

Scientific paper

10.1063/1.368758

Spatially-resolved studies of a YBaCuO thin film bridge using electron probe microanalysis (EPMA), low-temperature scanning electron microscopy (LTSEM), and magneto-optical flux visualization (MO) have been carried out. Variations in chemical composition along the bridge were measured by EPMA with 3 microns resolution. Using LTSEM the spatial distributions of the critical temperature, Tc, and of the local transition width, dTc, were determined with 5 microns resolution. Distributions of magnetic flux over the bridge in an applied magnetic field have been measured at 15 and 50 K by magneto-optical technique. The critical current density Jc as a function of coordinate along the bridge was extracted from the measured distributions by a new specially developed method. Significant correlations between Jc, Tc, dTc and cation composition have been revealed. It is shown that in low magnetic fields deviation from the stoichiometric composition leads to a decrease in both Tc and Jc. The profile of Jc follows the Tc-profile on large length scales and has an additional fine structure on short scales. The profile of Jc along the bridge normalized to its value at any point is almost independent of temperature.

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