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Enhancement of Pinning Energy and Critical Current Density in Tl2CaBa2Cu2O8 Films by Proton Irradiation

  • M. E. Reeves (a1), B. D. Weaver (a1), G. P. Summers (a1) (a2), R. J. Soulen (a1), W. L. Olson (a3) (a4), M. M. Eddy (a3), T. W. James (a3) and E. J. Smith (a3)...

Abstract

Measurements are presented which show the effect of proton irradiation on the irreversibility line and critical current in Tl2 CaBa2Cu2O8 thin films. These data show that the irreversibility line is dependent on the defect structure and that the pinning energy is increased by proton irradiation. This leads to an increase in the critical current density at 60 K for the lowest radiation dose. Further irradiation reduces the critical current, even while the irreversibility line is enhanced.

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11. The E-J curve is calculated from the experimentally measured third-harmonic voltage vs. coil current curve. The electric field (E) at the film is calculated as (l/2πrc) (dφc /dt) where φc is the flux contain within a radius rc, the mean radius of the coil. At low distortion levels, the third harmonic voltage is proportional to φ;c. To plot E vs. J, the critical current density is estimated to be the sheet-current induced in a perfectly conducting film divided by the film thickness. The estimates for E and J are accurate in the limit where the ac field is effectively screened by currents induced in the film. In this experiment, the ac currents are low enough that this condition is satisfied.
12. Tinkham, M, Introduction to Superconductivity, (Krieger, Robert E., Malabar, Florida 1980).

Enhancement of Pinning Energy and Critical Current Density in Tl2CaBa2Cu2O8 Films by Proton Irradiation

  • M. E. Reeves (a1), B. D. Weaver (a1), G. P. Summers (a1) (a2), R. J. Soulen (a1), W. L. Olson (a3) (a4), M. M. Eddy (a3), T. W. James (a3) and E. J. Smith (a3)...

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