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Magnetooptic observation of the Meissner effect in YBa2Cu2O7−x single crystals

✍ Scribed by L.A. Dorosinskii; M.V. Indenbom; V.I. Nikitenko; A.A. Polyanskii; R.L. Prozorov; V.K. Vlasko-Vlasov

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
582 KB
Volume
206
Category
Article
ISSN
0921-4534

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✦ Synopsis

We report the first real-time, direct magnetooptic images of the Meissner effect in doped YBa2Cu307_-x single crystals. Measurements of flux profiles across field-cooled samples reveal increased pinning due to impurities. The strongest effect of the present dopants (Mn, Ca or Si) was found for Si. Furthermore, the spatial resolution was sufficient to observe enhanced trapping of vortices in heavily twinned regions, indicating a strong contribution of twin boundaries to pinning at higher temperatures.

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✍ M.V. Kartsovnik; G.Yu. Logvenov; K.Ya. Soifer 📂 Article 📅 1990 🏛 Elsevier Science 🌐 English ⚖ 287 KB

The effect of sample size on magnetic flux expulsion in field cooling experiments has been studied on YBa2Cu307\_ X single crystals sliced parallel to the basal plane in several steps. A simple model is proposed which describes the process of magnetic flux expulsion out of hard superconductors. Qual