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Introducing nano heterogeneous phases into YBa2Cu3O7-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 via the metal organic deposition (MOD) method offers an effective solution. This approach 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 for enhancing magnetic flux pinning and increasing the critical current density under applied magnetic fields via MOD route. In this study, we adopted the prefabricated nanocrystals addition technology to introduce the mono-dispersed small-sized BaZrO3(BZO) nanocrystals as flux pinning centers in YBCO high-temperature superconducting tapes, resulting the significant enhancement of the in-field performance of YBCO films at low temperatures. This study systematically examined the effects of adding BZO nanocrystals with an initial size of approximately 8 nm at various concentrations from 4 mol% to 10 mol%. The results indicate that the optimal concentration for improving both self-field and field properties of YBCO is 8 mol% BZO under temperature conditions of 4.2 K, 30 K, and 77 K. At 30 K and 3 T, the Fp value for the sample with 8 mol% BZO was approximately 92.06 GN/m3, which is 1.54 times higher than that of the 4 mol% BZO sample and 2.3 times higher than that of the original sample.
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Keywords:
- YBa2Cu3O7-δ /
- flux pinning /
- BaZr3 addition /
- critical current
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