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• W82268005 abstract "The complex ac susceptibilities, x = X' i ~ , of thin films of the high temperature superconductors (HTS) YBa2Cu307-6 (YBCO) and TI-Ba-Ca-Cu-0 (TBCCO) have been studied as functions of temperature, driving field amplitude, and ac frequency. The temperature and field dependences of the measured ac susceptibilities were found to be in good agreement with model calculations. The peak positions of X were used to determine the temperature-dependent critical current density j,(T). Values of the critical current densities were between those obtained by inductive and magnetic flux mapping techniques. It was found that the ac susceptibilities of HTS thin films depend weakly on the frequency of the applied field. The frequency-dependent X peak temperature, Tp(f), was interpreted with a model based on thermally activated flux creep. Magnetic flux densities normal to the film plane for rectangular HTS thin films were mapped by means of a scanning micro-Hall probe (25 x 25 pm active area). The applied fields were oriented perpendicular to the film surface, along the z axis. The flux density maps, BZ(x,y), for uniform thin-film samples showed patterns which reflect the symmetry of the sample geometry. An inverse calculation algorithm was developed to convert the measured Bz maps into thinfilm sheet magnetization maps and sheet current maps. The inverse calculations showed that the sheet currents are always present over the entire sample, including the vortex-free region. The sheet currents reach the critical values in the vortex-penetrated regions. In the vortex-free regions the sheet currents are unsaturated. The critical sheet currents tend to follow the sample edges. This sheet current distribution explains the effective shielding or trapping of the magnetic flux along the film diagonals. The unsaturated sheet currents along the virgin path of the hysteresis loop circulate in round loops; after the field reverses its direction the unsaturated sheet currents follow multiply-connected patterns. It is shown that the multiply-connected current patterns can be reconstructed from the superposition of two appropriate initial current distributions obtained along the virgin path. The critical current density was found to depend on local magnetic flux density, and it follows the Kim model. The sheet current was also found to be very sensitive to defects in the films. From the known sheet current distributions, the spatial distributions of the total flux density B(x,y,z), including the tangential components Bx ,y(~ ,y ,~) , were calculated in the vicinity of the thin-film samples. The total flux distributions allow one to visualize the flux behavior in various vortex states for HTS thin-film superconductors. The quantitative information obtained by the inductive and flux mapping techniques has proven useful in optimizing the deposition conditions for HTS thin films for further device applications." @default.
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• W82268005 date "1995-01-01" @default.
• W82268005 modified "2023-09-27" @default.
• W82268005 title "MAGNETIC AC SUSCEPTIBILITY, MAGNETIC FLUX MAPPING, AND CURRENT DISTRIBUTIONS IN HIGH TEMPERATURE THIN-FILM SUPERCONDUCTORS" @default.
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