Abstract
The intergrain interface of unconventional superconductors suppresses the order parameter and, thus, serves as a bottleneck for the supercurrent. Such a characteristic of the grain interface is a major limiting factor for the lossless-current-carrying capacity of superconducting transmission lines on the one hand, but can also provide a clue to the development of Josephson elements on the other. We investigated the critical transition properties of the MgB2 intergrain nanobridges patterned by using a focused ion beam. The nanobridge containing a single intergrain interface had nominal dimensions of 200 ȁ 300 nm in width and length. We studied the current-voltage characteristics, the temperature-dependent critical current, and the normal state resistance. The measured MgB2 interface properties showed a wide spectrum of the coupling strength, ranging from a weak Josephson coupling to a very strong coupling comparable to an intragranular one. The origins of such a variety of intergrain coupling strengths were analyzed in conjunction with the lattice structure at the grain interface.
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D. Dimos, P. Chaudhari, J. Mannhart and F. K. LeGoues, Phys. Rev. Lett. 61, 219 (1988).
K. P. Daly, W. D. Dozier, J. F. Burch, S. B. Coons, R. Hu, C. E. Platt and R. W. Simon, Appl. Phys. Lett. 58, 543 (1991).
K. Char, M. S. Colclough, S. M. Garrison, N. Newman and G. Zaharchuk, Appl. Phys. Lett. 59, 733 (1991).
D. Mijatovic, A. Brinkman, I. Oomen, G. Rijnders, H. Hilgenkamp, H. Rogalla and D. H. A. Blank, Appl. Phys. Lett. 80, 2141 (2001).
H. Shimakage, K. Tsujimoto, Z. Wang and M. Tonouchi, Appl. Phys. Lett. 86, 072512 (2005).
K. Ueda, S. Saito, K. Semba and T. Makimoto, Appl. Phys. Lett. 86, 172502 (2005).
T. H. Kimand J. S. Moodera, J. Appl. Phys. 100, 113904 (2006).
J. I. Kye, H. N. Lee, J. D. Park, S. H. Moon and B. Oh, IEEE Trans. Appl. Supercond. 13, 1075 (2003).
K. Chen, Y. Cui, Q. Li, X. X. Xi, S. A. Cybart, R. C. Dynes, X. Weng, E. C. Dickey and J. M. Redwing, Appl. Phys. Lett. 88, 222511 (2006).
A. Brinkman, D. Veldhuis, D. Mijatovic, G. Rijnders, D. H. A. Blank, H. Hilgenkamp and H. Rogalla, Appl. Phys. Lett. 79, 2420 (2001).
S. G. Lee, S. H. Hong, W. K. Seong and W. N. Kang, Appl. Phys. Lett. 95, 202504 (2009).
S. G. Lee, S. H. Hong, W. N. Kang and D. H. Kim, J. Appl. Phys. 105, 013924 (2009).
X. Zeng, A. V. Pogrebnyakov, A. Kotcharov, J. E. Jones, X. X. Xi, E. M. Lysczek, J. M. Redwing, S. Xu, Q. Li, J. Lettier, D. G. Schlom, W. Tian, X. Pan and Z-K. Liu, Nature Mater. 1, 1 (2002).
W. K. Seong, J. Y. Huh, W. N. Kang, J-W. Kim, Y-S. Kwon, N-K. Yang and J-G. Park, Chem. Vap. Deposition 13, 680 (2007).
S. G. Lee, S. H. Hong, W. K. Seong and W. N. Kang, Supercond. Sci. Tech. 22, 064008 (2009).
M. Sigrist and T. M. Rice, J. Phys. Soc. Jpn. 61, 4283 (1992).
Yu. S. Barash, A. V. Galaktionov and A. D. Zaikin, Phys. Rev. B 52, 665 (1995).
H. Hilgenkamp and J. Mannhart, Rev. Mod. Phys. 74, 485 (2002).
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Lee, S.H., Lee, SG. & Kang, W.N. Superconducting transition properties of grain boundaries in MgB2 films. Journal of the Korean Physical Society 66, 7–11 (2015). https://doi.org/10.3938/jkps.66.7
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DOI: https://doi.org/10.3938/jkps.66.7