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Possible entanglement of the vortices in DyBa2Cu3O7-(Y1−xPrx)Ba2Cu3O7 coupled hetero-structures

✍ Scribed by P. Fivat; J.-M. Triscone; M. Andersson; H. Obara; Ø. Fischer

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
256 KB
Volume
235-240
Category
Article
ISSN
0921-4534

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✦ Synopsis

Thermally activated flux motion is studied in proximity coupled multilayers, containing a number N of 24.~ thick DyBa2Cu307 layers separated by 96A (or more) of (Yi.xPrx)Ba2Cu307 alloy (x--0.4, x=0.55). In contrast to ultra-thin decoupled layers, for which we find that the activation energy for flux motion U--logB (H//c), coupled samples show a cross-over to a power law behaviour U--B °s at a magnetic field H*. This characteristic field depends on the anisotropy and decreases as N increases, a behaviour which can be understood in terms of the entanglement of the vortices, resulting in a relative increase of U due to the flux line crossing energy.

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High-Tc superconducting properties in (Y
High-Tc superconducting properties in (Y1−xTlx)Ba2Cu3O7−y, Y(Ba1−xKx)2Cu3O7−y and YBa2(Cu1−xMgx)3O7−y
✍ Y. Saito; T. Noji; A. Endo; N. Higuchi; K. Fujimoto; T. Oikawa; A. Hattori; K. F 📂 Article 📅 1987 🏛 Elsevier Science ⚖ 186 KB

The concentration dependence of the transition temperature T c has been studied in the high-T c compounds (Y~ xTlx)-Ba2Cu307 y, Y(Ba 1 xKx)2Cu307 y and YBa2(Cu I xMg~)307 y. In the TI-compound, the results show little effect on T C. In the K-compound, T~ gradually drops with increasing K concentrati