Flux pinning by columnar defects in high-temperature superconducting crystals

Y-Ba-Cu-O:123 and Bi-Sr-Ca-Cu-O:2212 crystals were irradiated with 5.8 GeV Pb ions. The columnar defects, produced by this irradiation are expected to yield the strongest possible pinning energy. Indeed, there is an apparent increase in the width of the magnetization curves. However, the results of...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 195; pp. 407 - 410
Main Authors Konczykowski, M., Yeshurun, Y., Klein, L., Yacoby, E.R., Chikumoto, N., Vinokur, V.M., Feigel'man, M.V.
Format Journal Article Conference Proceeding
LanguageEnglish
Published Lausanne Elsevier B.V 10.05.1993
Elsevier
Subjects
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Properties of type I and type II superconductors
Superconductivity
Flux pinning
Magnetization
Magnetic relaxation
Irradiation defect
Ion beam
Irradiation
Bismuth Calcium Copper Strontium Oxides Mixed
Crystal defect
Vortex
Barium Copper Yttrium Oxides Mixed
High temperature superconductor
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Summary:Y-Ba-Cu-O:123 and Bi-Sr-Ca-Cu-O:2212 crystals were irradiated with 5.8 GeV Pb ions. The columnar defects, produced by this irradiation are expected to yield the strongest possible pinning energy. Indeed, there is an apparent increase in the width of the magnetization curves. However, the results of magnetic relaxation experiments indicate the energy barrier for flux creep from the columnar defects much smaller than expected pinning energy. This effect is explained in terms of nucleation of vortex loop mechanism of flux creep. The estimate of pinning energy of columnar defect can be obtained from measurement of the angular dependence of the magnetization curves.
ISSN:0925-8388
1873-4669
DOI:10.1016/0925-8388(93)90766-G