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.
Similar content being viewed by others
References
M. Kim, G. Duscher, N.D. Browning, K. Sohlberg, S.T. Pantelides, and S.J. Pennycook, Phys. Rev. Lett. 86, 4056 (2001).
D. Dimos, P. Chaudhari, and J. Mannhart Phys. Rev. B41, 4038 (1990).
Z. G. Ivanov, P. Å. Nilsson, D. Winkler, J. A. Alarco, T. Claeson, A. Stepantsov, and A. Tzalenchuk, Appl Phys Lett. 59, 3030 (1991).
E.M. James, N. D. Browning, A. W. Nicholls, M. Kawasaki, Y. Xin, and S. Stemmer, J. Elect. Micr. 47, 561 (1998).
S. J. Pennycook and P. D. Nellist, in D. G. Rickerby, U. Valdré and G. Valdré (eds.) Impact of Electron and Scanning Probe Microscopy on Materials Research, Kluwer Academic Publisers, The Netherlands, p161 (1999).
P. D. Nellist and S. J. Pennycook, in P. W. Hawkes (ed.) Advances in Imaging and Electron Physics, Academic Press 113, 148 (2000).
N. D. Browning, M. F. Chisholm, and S. J. Pennycook, Nature 366, 143 (1993).
G. Duscher, N. D. Browning, and S. J. Pennycook, Phys. Stat. Sol. (a) 166, 327 (1998).
P. D. Nellist and S. J. Pennycook, Phys. Rev. Lett. 81, 4156 (1998).
A. J. McGibbon, S. J. Pennycook, and J. E. Angelo, Science 269, 519 (1995).
Y. Xin, S. J. Pennycook, N. D. Browning, P. D. Nellist, S. Sivananthan, F. Omnès, B. Beaumont, J.-P. Faurie, and P. Gibart, Appl. Phys. Lett. 72, 2680 (1998).
M. M. McGibbon, N. D. Browning, M. F. Chisholm, A. J. McGibbon, and S. J. Pennycook, V. Ravikumar, and V. P. Dravid, Science 266, 102 (1994).
M. M. McGibbon, N. D. Browning, A. J. McGibbon, and S. J. Pennycook, Phil. Mag. A73, 625 (1996).
N. D. Browning, S. J. Pennycook, M. F. Chisholm, M. M. McGibbon and A. J. McGibbon, Interface Science 2, 397 (1995).
M. F. Chisholmand S. J. Pennycook. Mater. Res. Soc. Bull. 22, 53 (1997)
P. Hohenberg and W. Kohn, Phys. Rev. 136, B864 (1964)
W. Kohn and L.J. Sham, Phys. Rev. 140, A1133 (1954).
D. Vanderbilt, Phys. Rev. B41, 7892 (1990).
H. J. Monkhorst and J. D. Pack, Phys. Rev. B13, 5188 (1976).
N. D. Browning, M. F. Chisholm, D. P. Norton, D. H. Lowndes and S. J. Pennycook, Physica C 212, 185 (1993).
N. D. Browning, J. Yuan and L. M. Brown, Physica C 202, 12 (1992).
J. Halbritter, Phys. Rev. B 46 (1992) 14861, Phys Rev. B 48 (1993) 9735.
H. Hilgenkamp and J. Mannhart, Appl. Phys. Lett. 73, 265 (1998).
M. F. Chisholm and S. J. Pennycook, Nature 351, 47 (1991).
A. Gurevich and E. A. Pashitskii Phys. Rev. B57, 13878 (1998).
H. Hilgenkamp, J. Mannhart and B. Mayer, Phys. Rev. B53, 14586 (1997).
D. P. Norton et al., Science, 274 (1996) 755.
X. D. Wu et al., Appl. Phys. Lett., 67 (1995) 2397.
D. Agassi and J. R. Cullen, Physica C 316 (1999) 1.
D. Agassi, C. S. Pande and R. A. Masumura, Phys. Rev.B. 52 (1995) 16237.
D. T. Verebelyi, C. Cantoni, J. D. Budai, D. K. Christen, H. J. Kim and J. R. Thompson, Appl. Phys. Lett. 78, 2031 (2001)
We plot their results only for boundaries close to a pure tilt geometry (rotation about the caxis).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Agassi, D., Pennycook, S.J., Christenb, D.K. et al. Critical Currents at Grain Boundaries in High Temperature Superconductors. MRS Online Proceedings Library 689, 81 (2001). https://doi.org/10.1557/PROC-689-E8.1
Published:
DOI: https://doi.org/10.1557/PROC-689-E8.1