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Advances in Cryogenic Engineering Materials : Part A by K. Tachikawa (auth.), R. P. Reed, F. R. Fickett (eds.) PDF

By K. Tachikawa (auth.), R. P. Reed, F. R. Fickett (eds.)

ISBN-10: 1461398800

ISBN-13: 9781461398806

ISBN-10: 1461398827

ISBN-13: 9781461398820

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Extra resources for Advances in Cryogenic Engineering Materials : Part A

Example text

These systems may be considered to be of quasi-lower dimensionality where only the degrees of freedom f2 and f1 of the paired fermions are restricted in their nontunneling conduction paths. 6 yields 10K, 40K, and 300K in 3, quasi-2, and quasi-1 dimensions. Interpreting the ceramic oxide case as one in which the interchain interactions are equal to the intrachain interactions, leads to Tc = (Tc 1 Tc2)lf2 = (300K x 40K)1/2 = 1l0K';' lOOK (7) as the approximate transition temperature for these materials when there is clearly a combined linear and planar structure.

O > Current Anisotropic weak link network Before considering the general WLN there Is a particular limiting case which Is very illuminating. In this limit the WLN Is to be Imagined as a rectangular lattice with the macroscopic transport current flowing parallel to one of the principal axes. The lines which make up this lattice each contain a single weak link. The simplifying feature in this limit is 'to assume that the weak links which lie on arms normal to the macroscopic current flow are completely superconductlng at all times.

Typical plots are shown in figures 2 and 6. Plots of the latter type invariably show a characteristic linearity which emerged from the theoretical model discussed above. The plots against Log E show an approximately linear decrease with increasing E for all values of applied magnetic field and for all values of sample density. The behaviour of the critical current as a function of applied field was examined at different voltage criteria. decrease in critical current with applied field. ,7, and this variation is ascribed to a progressive increase in the mean junction area as the sample density is increased.

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Advances in Cryogenic Engineering Materials : Part A by K. Tachikawa (auth.), R. P. Reed, F. R. Fickett (eds.)

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