Abstract
Three types of superconducting GdBa2Cu3O7−x (GdBCO) layers containing rods of either BaHfO3 (BHO), BaZrO3 (BZO), or BaSnO3 (BSO) were fabricated by pulsed laser deposition on Hastelloy substrates with a CeO2 based textured buffer layer. The critical currents (J c) values of the GdBCO layers containing those nano-rods are enhanced compared with those of pristine GdBCO layer in high magnetic fields. In order to investigate the relationships between their superconductive properties and their nanostructures, they were characterized in detail by transmission electron microscopy (TEM). TEM is the only method for direct observation of these nano-rods in the GdBCO grains. The GdBCO layers were mainly composed of c-axis oriented GdBCO grains containing numerous nano-sized rods. The crystal orientation relationships between the GdBCO and the nano-rods were as follows; (001)GdBCO//(001)nano-rods and (100)GdBCO//(100) nano-rods. The average diameters of the BHO and the BZO nano-rods were 4.5 and 5.6 nm, respectively. The BSO nano-rods were thicker than other rods. These nano-rods in the central region of the c-axis oriented GdBCO grains were aligned parallel to the c-axis of the GdBCO, while nano-rods in the outer region of the c-axis oriented grains were tilted away from the c-axis. With increase in the thickness of the GdBCO layers, the ratio of the BZO or the BSO nano-rods aligned parallel to the c-axis to those tilted away from the c-axis decreased, so that the J c-B-θ profiles of the thicker GdBCO layers containing the BZO or the BSO nano-rods became flatter. The BHO nano-rods were homogeneously distributed throughout the GdBCO, and their average length of was less than that of the other nano-rods. The homogeneous distribution and short length of the BHO nano-rods enhanced the J c values of the GdBCO layers containing them in high magnetic fields. The J c-B-θ profiles of the GdBCO layers containing the BHO were independent of the layer thickness. From these results, we will discuss about the morphologies and distributions of suitable vortex pinning for applications of GdBCO coated conductor in high magnetic fields.
Similar content being viewed by others
References
Driscoll JLM, Foltyn SR, Jia QX, Wang H, Serquis A, Civale L, Maiorov B, Hawley M, Maley MP, Peterson DE (2004) Nat Mater 3:439–441
Haugan T, Barnes PN, Wheeler R, Meisenkothen F, Sumption M (2004) Nature 430:867–870
Matsumoto K, Horide T, Ichinose A, Horii S, Yoshida Y, Mukaida M (2005) Jpn J Appl Phys 44:L246–L248
Yamada Y, Takahashi K, Kobayashi H, Konishi M, Watanabe T, Ibi A, Muroga T, Miyata S, Kato T, Hirayama T, Shiohara Y (2005) Pinning effective nano-epitaxial columnar structure and defect in Y(RE)Ba2Cu3O7−x coated conductor. Appl Phys Lett 87:132502
Takahashi K, Kobayashi H, Yamada Y, Ibi A, Fukushima H, Kobayashi M, Miyata S, Shiohara Y, Kato T, Hirayama T (2006) Supercond Sci Technol 19:924–929
Kato T, Sasaki H, Gotoh Y, Sasaki Y, Hirayama T, Takahashi K, Konishi M, Kobayashi H, Ibi A, Muroga T, Miyata S, Watanabe T, Yamada Y, Izumi T, Shiohara Y (2006) Physica C 445–448:628–632
Yamada K, Ichinose A, Tomokiyo Y, Shingai Y, Matsumoto K, Yoshida Y, Horii S, Kita R, Toh S, Kaneko K, Mori N, Mukaida M (2007) Jpn J Appl Phys 46(2):708–711
Ichinose A, Mele P, Horide T, Matsumoto K, Goto G, Mukaida M, Kita R, Yoshida Y, Horii S (2008) Physica C 468:1627–1630
Mele P, Matsumoto K, Horide T, Ichinose A, Mukaida M, Yoshida Y, Horii S, Kita R (2008) Supercond Sci Technol 21:032002
Kaneko K, Furuya K, Yamada K, Sadayama S, Barnard JS, Midgley PA, Kato T, Hirayama T, Kiuchi M, Matsushita T, Ibi A, Yamada Y, Izumi T, Shiohara Y (2010) J Appl Phys 108:063901
Gutiérrez J, Llordés A, Gázquez J, Gibert M, Romà N, Ricart S, Pomar A, Sandiumenge F, Mestres N, Puig T, Obradors X (2007) Nat Mater 6:367–373
Miura M, Kato T, Yoshizumi M, Yamada Y, Izumi T, Shiohara Y, Hirayama T (2008) Appl Phys Exp 1:051701
Tobita H, Notoh K, Higashikawa K, Inoue M, Kiss T, Kato T, Hirayama T, Yoshizumi M, Izumi T, Shiohara Y (2012) Supercond Sci Technol 25:062002
Ibi A, Iwai H, Takahashi K, Muroga T, Miyata S, Watanabe T, Yamada Y, Shiohara Y (2005) Physica C 426–431:910–914
Kato T, Ssasaki H, Watanabe T, Ibi A, Iwai H, Iijima Y, Kakimoto K, Sutoh Y, Muroga T, Miyata S, Yamada Y, Saitoh T, Izumi T, Ssasaki Y, Hirayama T, Shiohara Y, Ikuhara Y (2006) J Mater Sci 41:2587. doi:10.1007/s10853-006-7785-2
Kato T, Yoshida R, Chikumoto N, Lee S, Tanabe K, Izumi T, Hirayama T, Shiohara Y (2011) Physica C 471:1012–1016
Acknowledgements
This work was supported by New Energy and Industrial Technology Development Organization (NEDO) as the project for Development of Materials & Power Applications of Coated Conductors.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Yokoe, D., Kato, T., Tobita, H. et al. Transmission electron microscopy study of GdBa2Cu3O7−x containing nano-sized BaMO3 (M: Hf, Zr, Sn) rods fabricated by pulsed laser deposition. J Mater Sci 48, 125–131 (2013). https://doi.org/10.1007/s10853-012-6898-9
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10853-012-6898-9