摘要
为解决传统元素掺杂YBa_(2)Cu_(3)O_(7-δ)(YBCO)薄膜时掺杂相尺寸不可控和分布不均匀的问题,本文采用预制纳米晶添加技术在YBCO高温超导带材中引入了弥散分布的小尺寸BaZrO_(3)(BZO)纳米晶作为磁通钉扎中心,显著提高了YBCO薄膜在低温下的在场性能.本文系统研究了原始尺寸约为8 nm的BZO纳米晶不同浓度的添加效果.实验结果表明,在4.2,30和77 K温度条件下,BZO纳米晶添加对YBCO的自场和在场性能提升的最佳摩尔百分比浓度为8%.在30 K@3 T时,BZO-8%的F_(p)约为92.06 GN/m^(3),分别是BZO-4%和原始样品的1.54倍和2.3倍.
Introducing nano heterogeneous phases into YBa_(2)Cu_(3)O_(7)-d(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(≈2x)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 BaZrO_(3)(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/m^(3),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.
作者
吴文静
陈静
黄荣铁
李敏娟
刘志勇
蔡传兵
WU Wenjing;CHEN Jing;HUANG Rongtie;LI Minjuan;LIU Zhiyong;CAI Chuanbing(Shanghai Key Laboratory of High Temperature Superconductor,Department of Physics,Shanghai University,Shanghai 200444,China;Shanghai Creative Superconductor Technologies Co.Ltd.,Shanghai 201401,China)
出处
《物理学报》
北大核心
2025年第19期293-299,共7页
Acta Physica Sinica
基金
国家重点研发计划(批准号:2022YFE03150200)
国家自然科学基金(批准号:52172271,52307026,52477022)资助的课题。
