New Developments in High Temperature Superconductivity: by J. I. Budnick, Ch. Niedermayer (auth.), Jan Klamut, Boyd W.

By J. I. Budnick, Ch. Niedermayer (auth.), Jan Klamut, Boyd W. Veal, Bogdan M. Dabrowski, Piotr W. Klamut, Maciej Kazimierski (eds.)

This quantity provides the most recent advancements within the box of extreme temperature superconductivity. It focusses on microscope description, actual houses, and fabrics and purposes. The talks offered were generally edited and up-to-date with the intention to current a worthy source not just for the complex reader, but in addition for a bigger readership looking experiences of present difficulties in hot temperature superconductivity. those court cases are a follow-up of a prior assembly which has been released as quantity 475 of the Lecture Notes in Physics.

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Extra info for New Developments in High Temperature Superconductivity: Proceedings of the 2nd Polish-US Conference Held a Wrocław and Karpacz, Poland, 17–21 August 1998

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These compounds melt peritectically and the pressure in a closed container above inerting temperature reaches a value corresponding to the decomposition pressure of HgO. This is above 100 bar. In order to prevent the decomposition during synthesis and crystal growth we have applied high Ar gas pressure of about 10 kbar [3,4,5]. 5 g/cm 3 at this pressure, the diffusion of volatile components is strongly suppressed. In order to decrease melting temperature, flux growth from solution can be applied.

Irreversibility lines for pure and substituted Nd123 compounds to the formation of single-phase materials. Annealing at high oxygen pressure usually causes an increase of Tc. We have found that the Tc of most of the RE123 materials can be increased to 94 - 95 K . 1). 02, respectively. No increase of Tc was obtained for R E = Nd. The materials with the highest Tc's are currently being studied for Jc and Birr. 3 The YBa2_=Sr=Cu3-uMouOz Compounds The layered Y123 materials, that consist of alternating layers of CuO-chains and double-CuO2-planes, offer an opportunity to modify their structural and physical properties by carrying out substitutions of small ionic-size atoms on the Cu-chain site without disturbing the perfect arrangement of the Cu and O atoms in the superconducting planes.

Chemical substitutions on various crystallographic sites were made to reduce the buckling of the CuO2-planes. Substitutions of Sr for Ba and transition elements for copper were made to shorten the distance between the double-CuO2-planes while preserving the "metallicity" of the blocking layer. The synthesis and annealing conditions were optimized to obtain the highest Tc. Improved critical currents and irreversibility fields were found for (Ndl-xLax)123 and YBaSrCua-~Mo~OT+d compounds. The existence of these materials indicates that it is possible to further enhance superconducting properties of YBa2CuaO7 materials by clever design of the crystal chemistry.

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