Abstract Grain boundaries (GBs), as extremely anisotropic pinning defects, have a strong impact on vortex motion in type-Ⅱ superconductors, and further on the macro level dominates the superconductivity for example the critical current density. Many previous studies indicated that mostly GB plays the role of a strong barrier for vortex motion, while an easy-flow channel just under some certain conditions. In order to thoroughly make clear of the questions of what is exactly the role of GB on vortex motion and how it works, in this article we developed a large scale molecular dynamic model and revealed the action of GB on vortex motion in type-Ⅱ superconductors. The most significant finding is that the role of GB on vortex motion can be changeable from a barrier to an easy-flow channel, and which is intrinsically determined by the competition effect correlated with its action on vortex between in the GB and no-GB regions. Such the competition effect essentially depends on the attributes of both the GB (described by the GB strength and angle θ) and no-GB pining regions (by the relative disorder strength αp/αv). Specifically, for a YBa2Cu3O7-x (YBCO) sample, to obtain a clear knowledge of vortex motion in GB region, we visualized the three typical trajectories of vortices during the three vortex movement stages. Further, in order to understand how GB results in the macro current-carrying property, corresponding to the current-voltage relation of the YBCO conductor, we obtained the average velocity vy of vortices varying with their driving force, which is nearly identical with the previous observations.
(Superconducting films and low-dimensional structures)
Fund: Project supported financially by the National Natural Science Foundation of China (Grant No. 12072101) and the Fundamental Research Funds for the Central Universities, China (Grant No. 2018B48714).
Yu Liu(刘宇), Xiao-Fan Gou(苟晓凡), and Feng Xue(薛峰) Barrier or easy-flow channel: The role of grain boundary acting on vortex motion in type-II superconductors 2021 Chin. Phys. B 30 097402
[1] Nattermann T and Scheidl S 2000 Adv. Phys.49 607 [2] Faleski M, Marchetti M and Middleton A 1996 Phys. Rev. B54 12427 [3] Dinner R B, Robinson A P, Wimbush S C, MacManus-Driscoll J L and Blamire M G 2011 Supercond. Sci. Technol.24 55017 [4] Horide T, Matsukida N, Ishimaru M, Kita R, Awaji S and Matsumoto K 2017 Appl. Phys. Lett.110 052601 [5] He A, Xue C and Zhou Y 2018 Chin. Phys. B27 057402 [6] Roas B, Schultz L and Saemann-Ischenko G 1990 Phys. Rev. Lett.64 479 [7] Hylton T L and Beasley M R 1990 Phys. Rev. B41 11669 [8] Daeumling M, Seuntjens J M and Larbalestier D C 1990 Nature346 332 [9] Klaassen F C, Doornbos G, Huijbregtse J M, van der Geest R C F, Dam B and Griessen R 2001 Phys. Rev. B64 184523 [10] Lin Z W, Gu G D, Mahmoud A S and Russell G J 2001 Physica C349 95 [11] Pan V, Cherpak Y, Komashko V, Pozigun S, Tretiatchenko C, Semenov A, Pashitskii E and Pan A V 2006 Phys. Rev. B73 054508 [12] Matsumoto K and Mele P 2010 Supercond. Sci. Technol.23 014001 [13] Schalk R M, Kundzins K, Weber H W, Stangl E, Proyer S and Bäuerle D 1996 Physica C257 341 [14] Dong L, Wu X, Hu Y, Xu X and Bao H 2021 Chin. Phys. Lett.38 027202 [15] Dong C, Huang H and Ma Y 2019 Chin. Phys. Lett.36 067401 [16] Reichhardt C, Olson C and Nori F 2000 Phys. Rev. B61 3665 [17] Enomoto Y and Mitsuda T 2002 Physica C367 60 [18] Xue F, Zhang Z, Zeng J and Gou X 2016 AIP Adv.6 055313 [19] Xue F and Gou X 2016 J. Supercond. Nov. Magn.29 2221 [20] Asai H and Watanabe S 2008 Phys. Rev. B77 224514 [21] Xue F, Gu Y and Gou X 2016 J. Supercond. Nov. Magn.29 2711 [22] Hilgenkamp H and Mannhart J 2002 Rev. Mod. Phys.74 485 [23] Durán C A, Gammel P L, Wolfe R, Fratello V J, Bishop D J, Rice J P and Ginsberg D M 1992 Nature357 474 [24] Vlasko-Vlasov V K, Dorosinskii L A, Polyanskii A A, Nikitenko V I, Welp U, Veal B W and Crabtree G W 1994 Phys. Rev. Lett.72 3246 [25] Zhu B, Dong J, Xing D and Wang Z 1998 Phys. Rev. B57 5075 [26] Jiang L, Xu W W, Hua T, Yu M, An D Y, Chen J, Jin B B, Kang L and Wu P H 2015 Sci. China Technol. Sci.58 493 [27] Chaturvedi H, Galliher N, Dobramysl U, Pleimling M and Täuber U C 2018 Eur. Phys. J. B91 1 [28] Marchetti M C and Vinokur V M 1994 Phys. Rev. Lett.72 3409 [29] Marchetti M C and Vinokur V M 1995 Phys. Rev. B51 16276 [30] Fily Y, Olive E, Di Scala N and Soret J C 2010 Phys. Rev. B82 134519 [31] Di Scala N, Olive E, Lansac Y, Fily Y and Soret J C 2012 New J. Phys.14 123027 [32] Zhu B Y, Xing D Y, Dong J and Zhao B R 1999 Physica C311 140
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
