微量Co^(3+)掺杂对GdBCO薄膜结构及超导性能的影响  

Effect of dilute Co^(3+) doping on structure and superconducting properties of GdBCO thin films

作　　者：田正健 王文涛[1,2] 霍堡垒 刘连 杨雪 赵勇 Tian Zhengjian;Wang Wentao;Huo Baolei;Liu Lian;Yang Xue;Zhao Yong(Key Laboratory of Advanced Technologies of Materials(Ministry of Education of China),School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China;Superconductivity and New Energy R&D Center,Southwest Jiaotong University,Chengdu 610031,China;College of Physics and Energy,Fujian Normal University,Fuzhou 350117,China)

机构地区：[1]西南交通大学材料科学与工程学院,材料先进技术教育部重点实验室,成都610031 [2]西南交通大学,超导与新能源研究开发中心,成都610031 [3]福建师范大学物理与能源学院,福建福州350117

出　　处：《低温与超导》2021年第7期1-5,66,共6页Cryogenics and Superconductivity

基　　金：国家自然科学基金(51271155,51377138);装备预研领域基金(61409230502);四川省科技计划项目(2021YJ0060)资助。

摘　　要：采用自主研发的无氟高分子辅助金属有机物沉积(FF-PAMOD)法在LaAlO_(3)单晶基底上制备微量Co^(3+)掺杂的GdBCO薄膜,研究不同掺杂量对薄膜结构和超导性能的影响。结果表明,掺杂量x为0.001的薄膜(GdBa_(2)Cu_(3-x)CoxO_(7-z))具有更好的c轴织构和更加平整致密的表面微结构,以及在77 K自场具有最高的临界电流密度(Jc)。此外,与纯样相比,该掺杂样品(x=0.001)在磁场下显示出更高的Jc(77 K, 30 K),这可能是Co^(3+)掺杂对薄膜外延生长的促进和掺杂引入的钉扎中心共同作用的结果。Dilute Co^(3+) doped GdBCO thin films were prepared on LaAlO3 single crystal substrates by self-developed fluorine-free polymer-assisted metal organic deposition(FF-PAMOD) method. The effect of different doping levels on the structure and superconducting properties of the films were investigated. The results show that the film with doping level x of 0.001(GdBa_(2)Cu_(3-x)CoxO_(7-z)) has better c-axis texture, smoother and denser surface microstructure as well as the highest critical current density(Jc) at 77 K and self-field. In addition, compared with the pure sample, this doped sample(x=0.001) shows higher Jc values under magnetic field at 77 K and 30 K, which may be attributed to the promotion of film’s epitaxial growth and introduction of effective flux pinning centers by Co^(3+) doping.

关 键 词：GdBCO超导膜 微量Co3+掺杂 化学溶液法 超导性能 

分 类 号：TB34[一般工业技术—材料科学与工程]