Skip to main content Accessibility help
×
Home

Critical Currents at Grain Boundaries in High Temperature Superconductors

  • D. Agassi (a1), S. J. Pennycook (a2), D. K. Christenb (a2), G. Duscher (a2) (a3), A. Franceschetti (a1) (a4) and S. T. Pantelides (a1) (a4)...

Abstract

We present atomic resolution Z-contrast images, electron energy loss spectroscopy (EELS) and theoretical calculations in support of a band-bending model for the effect of grain boundaries on critical currents. In the high angle regime, dislocation cores are closely spaced and the boundary is modeled as a continuous junction, with a width determined by the dislocation density per unit boundary length. This quantitatively explains the approximately exponential reduction in critical current. In the low angle regime, where dislocations are separated by substantial good passages, explicit calculations of flux pinning are presented. Significant differences are found between a strain and band-bending mechanism. Recent data fit the band-bending model and suggest substantial improvement is possible through doping to a flat band condition.

Copyright

References

Hide All
1 Kim, M., Duscher, G., Browning, N.D., Sohlberg, K., Pantelides, S.T., and Pennycook, S.J., Phys. Rev. Lett. 86, 4056 (2001).
2 Dimos, D., Chaudhari, P., and J. Mannhart Phys. Rev. B41, 4038 (1990).
3 Ivanov, Z. G., Nilsson, P. Å., Winkler, D., Alarco, J. A., Claeson, T., Stepantsov, A., and Tzalenchuk, A., Appl Phys Lett. 59, 3030 (1991).
4 James, E.M., Browning, N. D., Nicholls, A. W., Kawasaki, M., Xin, Y., and Stemmer, S., J. Elect. Micr. 47, 561 (1998).
5 Pennycook, S. J. and Nellist, P. D., in Rickerby, D. G., Valdré, U. and Valdré, G. (eds.) Impact of Electron and Scanning Probe Microscopy on Materials Research, Kluwer Academic Publisers, The Netherlands, p161 (1999).
6 Nellist, P. D. and Pennycook, S. J., in Hawkes, P. W. (ed.) Advances in Imaging and Electron Physics, Academic Press 113, 148 (2000).
7 Browning, N. D., Chisholm, M. F., and Pennycook, S. J., Nature 366, 143 (1993).
8 Duscher, G., Browning, N. D., and Pennycook, S. J., Phys. Stat. Sol. (a) 166, 327 (1998).
9 Nellist, P. D. and Pennycook, S. J., Phys. Rev. Lett. 81, 4156 (1998).
10 McGibbon, A. J., Pennycook, S. J., and Angelo, J. E., Science 269, 519 (1995).
11 Xin, Y., Pennycook, S. J., Browning, N. D., Nellist, P. D., Sivananthan, S., Omnès, F., Beaumont, B., Faurie, J.-P., and Gibart, P., Appl. Phys. Lett. 72, 2680 (1998).
12 McGibbon, M. M., Browning, N. D., Chisholm, M. F., McGibbon, A. J., and Pennycook, S. J., Ravikumar, V., and Dravid, V. P., Science 266, 102 (1994).
13 McGibbon, M. M., Browning, N. D., McGibbon, A. J., and Pennycook, S. J., Phil. Mag. A73, 625 (1996).
14 Browning, N. D., Pennycook, S. J., Chisholm, M. F., McGibbon, M. M. and McGibbon, A. J., Interface Science 2, 397 (1995).
15 Chisholmand, M. F. Pennycook., S. J. Mater. Res. Soc. Bull. 22, 53 (1997)
16 Hohenberg, P. and Kohn, W., Phys. Rev. 136, B864 (1964); W. Kohn and L.J. Sham, Phys. Rev. 140, A1133 (1954).
17 Vanderbilt, D., Phys. Rev. B41, 7892 (1990).
18 Monkhorst, H. J. and Pack, J. D., Phys. Rev. B13, 5188 (1976).
19 Browning, N. D., Chisholm, M. F., Norton, D. P., Lowndes, D. H. and Pennycook, S. J., Physica C 212, 185 (1993).
20 Browning, N. D., Yuan, J. and Brown, L. M., Physica C 202, 12 (1992).
21 Halbritter, J., Phys. Rev. B 46 (1992) 14861, Phys Rev. B 48 (1993) 9735.
22 Hilgenkamp, H. and Mannhart, J., Appl. Phys. Lett. 73, 265 (1998).
23 Chisholm, M. F. and Pennycook, S. J., Nature 351, 47 (1991).
24 Gurevich, A. and Pashitskii, E. A. Phys. Rev. B57, 13878 (1998).
25 Hilgenkamp, H., Mannhart, J. and Mayer, B., Phys. Rev. B53, 14586 (1997).
26 Norton, D. P. et al., Science, 274 (1996) 755.
27 Wu, X. D. et al., Appl. Phys. Lett., 67 (1995) 2397.
28 Agassi, D. and Cullen, J. R., Physica C 316 (1999) 1.
29 Agassi, D., Pande, C. S. and Masumura, R. A., Phys. Rev.B. 52 (1995) 16237.
30 Verebelyi, D. T., Cantoni, C., Budai, J. D., Christen, D. K., Kim, H. J. and Thompson, J. R., Appl. Phys. Lett. 78, 2031 (2001)
31 We plot their results only for boundaries close to a pure tilt geometry (rotation about the caxis).

Metrics

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