Advances in Superconductivity IV: Proceedings of the 4th by A. M. Campbell (auth.), Prof. Dr. Hisao Hayakawa, Dr. Naoki

By A. M. Campbell (auth.), Prof. Dr. Hisao Hayakawa, Dr. Naoki Koshizuka (eds.)

Five years have handed because the step forward within the severe temperature for superconductors. in this interval, many superconducting fabrics were came upon and built, and our wisdom of the actual and different homes of oxide superconductors has deepened via huge and in depth study. this data has complicated superconductivity technology and expertise from the preliminary wondering degree to a extra built yet nonetheless doubtful moment level the place learn job in superconductivity now overlaps with fields of program. as a rule talking, technological know-how resonates with know-how. technological know-how not just enhances but in addition competes with or stimulates expertise. New clinical wisdom has brought on the second one technological study level. a lot development has been made within the improvement of functional units, encouraging the applying of superconductors in components equivalent to human levitation, a excessive velocity levitated bearing, huge present reworking leads, and excessive frequency units. This technological growth has elevated our realizing of the technology concerned, corresponding to flux pinning and dynamics, and anomalous long-range superconducting interactions. At this significant degree, foreign cooperation and collaborative initiatives can successfully maintain competitive learn and improvement on the way to develop superconductivity to the following levels. The ISS Symposium is predicted to function a venue for expanding our wisdom of superconductivity and for changing visions for destiny examine and functions, in the course of the presentation and discus­ of the newest study effects. those court cases additionally target to summarize sion annual growth in high-Tc superconductivity in all fields.

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By A. M. Campbell (auth.), Prof. Dr. Hisao Hayakawa, Dr. Naoki Koshizuka (eds.)

Five years have handed because the step forward within the severe temperature for superconductors. in this interval, many superconducting fabrics were came upon and built, and our wisdom of the actual and different homes of oxide superconductors has deepened via huge and in depth study. this data has complicated superconductivity technology and expertise from the preliminary wondering degree to a extra built yet nonetheless doubtful moment level the place learn job in superconductivity now overlaps with fields of program. as a rule talking, technological know-how resonates with know-how. technological know-how not just enhances but in addition competes with or stimulates expertise. New clinical wisdom has brought on the second one technological study level. a lot development has been made within the improvement of functional units, encouraging the applying of superconductors in components equivalent to human levitation, a excessive velocity levitated bearing, huge present reworking leads, and excessive frequency units. This technological growth has elevated our realizing of the technology concerned, corresponding to flux pinning and dynamics, and anomalous long-range superconducting interactions. At this significant degree, foreign cooperation and collaborative initiatives can successfully maintain competitive learn and improvement on the way to develop superconductivity to the following levels. The ISS Symposium is predicted to function a venue for expanding our wisdom of superconductivity and for changing visions for destiny examine and functions, in the course of the presentation and discus­ of the newest study effects. those court cases additionally target to summarize sion annual growth in high-Tc superconductivity in all fields.

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Extra resources for Advances in Superconductivity IV: Proceedings of the 4th International Symposium on Superconductivity (ISS ’91), October 14–17, 1991, Tokyo

Example text

Also become more marked. We do not know why this is so but it mirrors in a limited way the more extreme transition from real shiny metals to oxides. 4 90 65 More indirect evidence comes from a number of results showing that the resistive transition is not altered if the the current is applied parallel to the field so that there is no Lorentz force. This is what would be expected if flux cutting was extremely easy and a decoupled set of discs is an extreme example of this. Finally on a more optimistic note recent results from Ell have shown that if the field is applied parallel to the planes, and the current is also in the planes, but perpendicular to the field, large current densities can be carried well above the generally accepted irreversibility line of BSCO.

The two materials are demonstrated clearly in AC susceptibility measurements in which the derivative of the flux entering is plotted as a function of AC amplitude. This shows how far the flux has penetrated, and it is found that there is a very sharp discontinuity separating penetration between the grains and penetration into the grains. This sharp discontinuity is perhaps the clearest indication of granularity. It is not seen in cast A 15 compounds, nor in Chevrell phases which can show many of the other magnetic characteristics of granular materials.

The effects of doping on the irreversibility line. Most experimental results show that the irreversibility line is relatively insensitive to pinning. There is certainly some effect, but this may be in part due to changes in the reversible parameters. However given the wide range of pinning strengths measured, a much wider range of reversibility lines would be expected if the effect was due to low energy pins. Another indication is that doping with Cobalt lowers the reversibility line although measurements of Be2 indicate a decrease with doping, so that the coherence length must be increased by the doping.

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