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

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

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96 .... -:Ji. 0T '" 4 6 8 10 In (t) Figure 2. 5K. M1 is the first measurement for the time sequence. Time is measured in seconds. 29 'l'able l. 65 Parameters of NbTi Wires A Filament Dia. 6 Jc(5T) A/mm2 2400 2650 2560 2010 NbTi Fig. m. At various fields indicated by filled circles in Fig. 1, decay measurements were made. An example of the long time decay as seen in the magnetization measurements for the initial field sweep of the sample is shown in Fig. 2, where we have plotted the ratio M(t)/M1 against lnt.

Rev. B. 17. 1175 (1978) 10. G. Blamire, J. Low Temp. Phys. 335, (1987) 11. G. E. Evetts, Phil. Mag. B. 51. 421-438. 1985 12. H. Brandt, J. Low Temp. Phys. 28 ,263 & 291, (1977) 13. N. Ovchlnnlov, Sov. Phys. JETP. 38, 854 (1979) 14. M. Campbell, Jpn. J. App!. Phys. Supp. 26-3. 2053 (1987) 15. G. E. Evetts. IEEE Trans. Magn. G-25. 1123 (1989) 19 BOSE-EINSTEIN GAS MODEL FOR Tc AND ENERGY GAP FOR MOST SUPERCONDUCTORS, ESPECIALLY THE CERAMIC OXIDES Mario Rabinowitz Electric Power Research Institute Palo Alto, CA 94303 ABSTRACT A generalized Bose-Einstein gas model is sufficient to derive reasonable estimates of T c, the energy gap, and the coherence length for all classes of superconductors such as the ceramic oxides, the metallics, heavy-fermion metals, metallic hydrogen, and neutron stars for 3-dimensional, quasi-2 and quasi-l dimensional states.

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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