J{sub c} and vortex pinning enhancements in Bi-, Tl-, and Hg-based cuprate superconductors via GeV proton irradiation

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Randomly oriented columnar defects provide an efficient mechanism for stabilizing the magnetic flux and current density in a variety of high-{Tc} superconductors. Protons with 0.8 GeV energy cause heavy constituent nuclei (Hg, Tl, Pb, Bi,...) to fission and the resultant fragments generate isotropically distributed columnar tracks. The main results are a significant enhancement of the persistent current density J, a shift of the irreversibility line towards higher fields and temperatures, and a marked reduction in the rate of current decay with time. With increasing crystalline disorder, {Tc} decreases at the rate of {approximately} 0.1--1 K per 10{sup 16} proton/cm{sup 2}. ... continued below

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10 p.

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Thompson, J.R.; Ossandon, J.G.; Krusin-Elbaum, L.; Song, K.J.; Christen, D.K.; Paranthaman, M. et al. December 1, 1997.

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Randomly oriented columnar defects provide an efficient mechanism for stabilizing the magnetic flux and current density in a variety of high-{Tc} superconductors. Protons with 0.8 GeV energy cause heavy constituent nuclei (Hg, Tl, Pb, Bi,...) to fission and the resultant fragments generate isotropically distributed columnar tracks. The main results are a significant enhancement of the persistent current density J, a shift of the irreversibility line towards higher fields and temperatures, and a marked reduction in the rate of current decay with time. With increasing crystalline disorder, {Tc} decreases at the rate of {approximately} 0.1--1 K per 10{sup 16} proton/cm{sup 2}. The optimal proton fluence lies in the range of (5--20) x 10{sup 16} p/cm{sup 2}. At these levels, J is enhanced by one or more orders of magnitude compared with unirradiated virgin materials and can be significantly large at T {ge} 100 K in tesla fields. In addition, the logarithmic decay rate dln(J/dln(t)) is diminished. By analyzing the decay rate of J with time in a Maley framework, the authors obtain the effective pinning energy U(J) of irradiated materials for comparison with the virgin superconductors.

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10 p.

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INIS; OSTI as DE98003148

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  • 8. US/Japan workshop on high temperature superconductivity, Tallahassee, FL (United States), 8-10 Dec 1997

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  • Other: DE98003148
  • Report No.: ORNL/CP--95981
  • Report No.: CONF-971227--
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 634096
  • Archival Resource Key: ark:/67531/metadc694017

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  • December 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 23, 2016, 3:08 p.m.

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Thompson, J.R.; Ossandon, J.G.; Krusin-Elbaum, L.; Song, K.J.; Christen, D.K.; Paranthaman, M. et al. J{sub c} and vortex pinning enhancements in Bi-, Tl-, and Hg-based cuprate superconductors via GeV proton irradiation, article, December 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc694017/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.