Skip to main content Accessibility help

Y2BaCuO5 Addition and Its Effects on Critical Currents in Large grains of YBa2Cu3O7-σ: A Quantitative Microstructural Study

  • Manoj Chopra (a1), R. L. Meng (a2), C. W. Chu (a2) and Siu-Wai Chan (a1)


The addition of Y2BaCuO5 (211) particles to large grain Yba2Cu3O7−δ (Y123) has significantly improved the critical current (Jc) in this material. Here a systematic quantitative analysis on the effect of the measured 211 present in large grains of Y123 has been performed, after the process of melt texturing, both on a microscopic and a nanoscopic scale with a systematic variation of the initial volume percent of 211 addition. From the correlation between critical current measurements and quantitative microscopy of both (001) and (110) sections, a maximum value of weighted Jc is observed corresponding to a measured Y123 volume percent of 20%. Although an increasing addition of 211 is effective in producing efficient flux pinning sites in the Y123 matrix, percolation paths in the Y123 matrix become limited for supercurrent. Accounting for the loss of liquid phase, we estimate an optimum initial volume of 211 for highest Jc to be 40%. Further correlation between the Jc and the true flux pinning force (Fp) shows a maximum pinning force for an initial 211 addition of 40%. However the pinning efficiency of the superconducting Y123 matrix is found to improve with an increasing 211 addition. Hence an optimum amount of 211 addition is essential for obtaining the best possible electrical characteristics in the superconducting composite.



Hide All
[1] Jin, S., Tiefel, T.H., Sherwood, R.C., Davis, M.E., Van Dover, R.B., Kammlott, G.W., Fastnacht, R.A. and Keith, H.D., Appl. Phys.Lert. 52 (1988), 2074.
[2.] Varanasi, C., Ginn, P.J. Physica C 207, 1993, 7984.
[3] Hor, P.H., Huang, Z.J., Gao, L., Meng, R.L., Xue, Y.Y., Chu, C.W., Jean, Y.C., and Farmer, J. Mod.Phys.Lett B, 4, (1990), 703.
[4]. Murakami, M., Gotoh, S., Fujimoto, H., Yamaguchi, K., Koshizuka, N. and Tanaka, S. Supercond.Sci. Technol. 4 S49.
[5]. Lee, D.F., Chaud, X., Salama, K. Japan.J.Appl.Phys, 31, 2411 1992
[6] Lee, D.F., Selvamanickam, V., Salama, K. Physica C 202, 8396 (1992).
[7]. McGinn, P., Zhu, N., Chen, W., Sengupta, S., Li, T. Physica C 176, 203208 (1991).
[8]. Jin, S., Kamlott, G.W., Tiefel, T.H., Kodas, T., Ward, T.L., Kroeger, D.M. Physica C 181, 5762 (1991).
[9]. Meng, R.L., Gao, L., Gautier, P., Ramirez, D., Sun, Y.Y. and Chu, C.W. submitted to Physica C June 1994.
[10] Bean, C.P., Phys.Rev.Lett. 8 250 (1962).
[11]. Voort, Vander, METALLOGRAPHY Principles and Practice (Mc Graw-Hill Book Company 1984) pp 426, 480.
[12] Chopra, Manoj, Chan, S.W., Meng, R.I.,Chu, C.W. Accepted J.M.R Feb 1996.
[13] Chopra, Manoj, Boyko, V.S., Meng, R.I.,Chu, C.W., Chan, S.W. in preparation.
[14] Zallen, Richard, The Physics of Amorphous Solids, (John Wiley and Sons Inc.) page 170
[15] Cardwell, D.A., Campbell, A.M., Interdisciplinary research center, (University of Cambridge) page 146.


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed