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Pinning effect on fluctuation conductivity in a superconducting untwinned YBa2Cu3O7-delta single crystal with columnar defects
- Authors
- Jin-Tae Kim; Y. K. Park; J.-C. Park; H. R. Lim; S. Y. Shim; D. H. Kim; W. N. Kang; J. H. Park; T. S. Hahn; S. S. Choi; W. C. Lee; J. D. Hettinger; K. E. Gray
- Issue Date
- Apr-1998
- Publisher
- American Physical Society
- Citation
- Physical Review B - Condensed Matter and Materials Physics, v.57, no.13, pp 7499 - 7502
- Pages
- 4
- Journal Title
- Physical Review B - Condensed Matter and Materials Physics
- Volume
- 57
- Number
- 13
- Start Page
- 7499
- End Page
- 7502
- ISSN
- 1098-0121
1550-235X
- Abstract
- The effect of columnar defects on the critical dynamics of a superconducting untwinned YBa2Cu3O7−δ (YBCO) single crystal has been investigated. The columnar defects are produced by Sn ion irradiation of which dose corresponds to a matching field of 1 T. The in-plane longitudinal resistivity of the irradiated YBCO crystal has been measured as a function of magnetic field H and temperature T. The extracted fluctuation conductivities are enhanced by the strong pinnings and do not exhibit the same three-dimensional (3D) XY scaling behavior as for the unirradiated YBCO single crystal; particularly at the magnetic field values near the matching field of 1 T, the fluctuation conductivities show a clear deviation from the critical dynamics. At higher magnetic fields, however, the signature of the 3D-XY scaling appears.
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