Influence of Irradiation-Induced Latent Tracks on Local Flux Pinning in Bi-2212 Crystals
M. Leghissa; Th. Schuster; W. Gerhäuser; S. Klaumünzer; M. R. Koblischka; H. Kronmüller; H. Kuhn; H.-W. Neumüller; G. Saemann-Ischenko
Журнал:
EPL (Europhysics Letters)
Дата:
1992-06-15
Аннотация:
For the first time the influence of irradiation-induced columnar defects (0.5 GeV I-ions) on flux line pinning in Bi-2212 crystals has been investigated by means of the high-resolution magneto-optical Faraday effect. By irradiating only a part of each sample, the local change in the flux pinning has been determined. Irradiated and nonirradiated parts have been investigated simultaneously under the same experimental conditions. At T = 5 K and μ<sub>0</sub>H<sub>ext</sub> = (0 ÷ 300) mT a large enhancement of j<sub>c, m</sub> is found in the irradiated region. The observation of the time dependence of the flux density distribution yields small values for the pinning potential U, supporting the model of two-dimensional pancake vortex pinning.
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