Research on enhancing the performance of YBa2Cu3O7–δ coated conductor through the incorporation of BaZrO3 nanocrystals

WU Wenjing; CHEN Jing; HUANG Rongtie; LI Minjuan; LIU Zhiyong; CAI Chuanbing

doi:10.7498/aps.74.20250728

Abstract

Introducing nano heterogeneous phases into YBa₂Cu₃O_7–δ (YBCO) superconducting films is a common way to improve its flux pinning properties and in-field performances. The heterogeneous phases generated through traditional element doping strategies is highly sensitive to the sintering conditions, making the growth of the nano inclusions difficult to control under high-temperature environments. Unintended large-scale growth and aggregation of the doped phases can significantly reduce the efficiency of flux pinning of YBCO superconducting films, thereby limiting the overall enhancement of pinning performance in superconducting thin films. This occurs because the size of the vortex core (≈2ξ) cannot be effectively matched with excessively large defects. To address this challenge, the incorporation of monodisperse, small-sized prefabricated nanocrystals into YBCO superconducting coated conductors fabricated by the metal organic deposition (MOD) method offers an effective solution. This method can significantly improve the uniformity of heterogeneous phase size and spatial distribution, enabling the formation of dispersed and size-controllable artificial flux pinning centers. Such a strategy represents one of the most promising methods of enhancing magnetic flux pinning and increasing the critical current density under applied magnetic fields through MOD route. In this study, the prefabricated nanocrystals addition technology is adopted to introduce the mono-dispersed small-sized BaZrO₃ (BZO) nanocrystals as flux pinning centers in YBCO high-temperature superconducting tapes, resulting in the significant enhancement of the in-field performance of YBCO films at low temperatures. This study systematically examines the effects of adding BZO nanocrystals with an initial size of approximately 8 nm at various mol concentrations from 4% to 10%. The results indicate that the optimal mole concentration for improving both self-field and field properties of YBCO is 8% BZO under temperature conditions of 4.2, 30, and 77 K. At 30 K and 3 T, the F_p value for the sample with a mole concentration of 8% BZO is approximately 92.06 GN/m³, which is 1.54 times higher than that of the mole concentration of 4% BZO sample and 2.3 times higher than that of the original sample.

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Authors and contacts

Corresponding author: LI Minjuan, minjuanli@shu.edu.cn ; CAI Chuanbing, cbcai@t.shu.edu.cn

Funds: Project supported by the National Key R&D Program of China (Grant No. 2022YFE03150200) and the National Natural Science Foundation of China (Grant Nos. 52172271, 52307026, 52477022).

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Vol. 74, Issue 19 - 2025-10-05

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