顶部热籽晶熔融织构生长法制备的单畴GdBCO块材的超导性能（英文）

doi:10.11896/cldb.21010223

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Abstract Alarge-sized GdBa₂Cu₃O_7-δ (GdBCO) bulk superconductor with high performance, which is 32 mm in diameter and 13 mm in thickness, has been successfully fabricated by the top-hot-seeded melt-texture growth process in air. The YBa₂Cu₃O_7-δ (Y123) is chosen as the liquid phase source, which can effectively avoid the leakage of the liquid phase during the crystal growth, ultimately leading to the performance improvement of the GdBCO bulk superconductor. Both superconducting properties and microstructure of the bulk have been investigated. It can be found that the superconducting transition temperature (T_C) keeps above 94 K, and the maximum trapped magnetic flux density (B_trap) of the bulk is 0.29 T. The highest critical current density (J_C) of 5.29×10⁴ A/cm² is obtained in the B2 specimen near the edge far from the surface of the bulk at 77 K in self field, which can be explained by the enrichment of the Gd₂BaCuO₅ (Gd211) particles. In the region close to the surface of the bulk, the pinning centers are mainly provided by the oxygen vacancies due to the insufficient liquid phase source. These oxygen vacancies highly aggregate under the seed and its diffusion rate decreases with the increase of the distance from the center during crystal growth, which results in a higher J_C of the C1 specimen under the seed than J_C of the B1 specimen near the edge. In comparison, in the region far from the surface of the bulk, the pinning centers are mainly provided by the Gd₂BaCuO₅ (Gd211) particles due to the sufficient liquid phase source. Owing to a large number of Gd211 particles as the effective pinning centers in the whole region far from the surface of the bulk, the J_C of the C2 specimen under the seed is close to that of the B2 specimen near the edge. Moreover, the J_C of both C2 and B2 specimens have been improved in intermediate and high fields because of the substitution of Ba²⁺ by Gd³⁺, which is vitally important for the engineering applications of the bulk superconductors.

Key words： single-domain GdBCO bulk superconductor top-hot-seeded melt-texture growth process trapped magnetic flux density critical current density

Published: 10 August 2022 Online: 2022-08-15

CLC number:

TG113.25

Fund:National Natural Science Foundation of China (11004129), the Scientific Research Starting Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China (SRF for ROCS, SEM), the Innovation Program of Shanghai Municipal Education Commission (11YZ197, 12ZZ174), the Shanghai Natural Science Foundation (16ZR1422700), and the General Education Course Construction Project of Shanghai University of Electric Power(20182203).

About author: Jiaying Zhang received her B.S. degree in Changzhou Institute of Technology in 2018. She is currently pur-suing her master's degree under the supervision of asso-ciate Prof. Zhang at College of Mathematics and Phy-sics, Shanghai University of Electric Power. Her research focuses on the growth and the performance of the high-temperature bulk superconductor.
Yufeng Zhang, associate professor, master's supervisor of Shanghai University of Electric Power. She received a grant from the Government of Japan to study for her Ph.D. degree in the Applied Physics Laboratory of Tokyo University of Marine Science and Technology in October 2004, and graduated in September 2007. From October 2007 to March 2009, her postdoctoral work was carried out at Tokyo University of Marine Science and Technology and Shibaura Institute of Technology in Japan, with the guidance of co-tutors Prof. Murakami and Prof. Izumi (experts in the international superconducting bulk). Her research interests are the performance and application of high temperature superconducting materials and magnetic oxides in complex systems. Dozens of scientific research articles have been in important academic journals, such as Phys. Rev. B, Supercond. Sci. & Tech.et al.

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	ZHANG Jiaying
	YUAN Jiuwei
	ZHANG Yufeng
	LOU Ziwei
	ZHOU Wenli
	ZHANG Xiaojuan
	PENG Lin
	XU Yan
	XU Jianming
	YANG Guiting
	IZUMI Mitsuru

Cite this article:

ZHANG Jiaying,YUAN Jiuwei,ZHANG Yufeng, et al. Superconducting Properties of Single-domain GdBCO Bulk Prepared by the Top-hot-seeded Melt-texture Growth Process[J]. Materials Reports, 2022, 36(15): 21010223-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21010223 OR http://www.mater-rep.com/EN/Y2022/V36/I15/21010223

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