Critical current density and AC magnetic susceptibility of high-quality FeTe_(0.5)Se_(0.5)superconducting tapes  

作　　者：Xin Zhou Wenjie Li Qiang Hou Wei Wei Wenhui Liu Ke Wang Xiangzhuo Xing Linfei Liu Jun-Yi Ge Yanpeng Qi Huajun Liu Li Ren Tsuyoshi Tamegai Yue Sun Zhixiang Shi 

机构地区：[1]School of Physics,Southeast University,Nanjing 211189,China [2]Department of Applied Physics,The University of Tokyo,Tokyo 113-8656,Japan [3]School of Physics and Physical Engineering,Qufu Normal University,Qufu 273165,China [4]School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China [5]Materials Genome Institute,Shanghai University,Shanghai 200444,China [6]School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China [7]Institute of Plasma Physics,Chinese Academy of Sciences,Hefei,Anhui 230031,China [8]State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430030,China

出　　处：《Superconductivity》2024年第4期1-8,共8页超导(英文)

基　　金：supported by the National Key R&D Program of China(Grant No.2018YFA0704300);the Fundamental Research Funds for the Central Universities 2242024k30029.

摘　　要：Iron telluride‐selenium superconducting materials,known for their non‐toxicity,ease of preparation,simple structure,and high upper critical fields,have attracted much research interest in practical application.In this work,we conducted electrical transport measurements,magneto‐optical imaging,and AC magnetic susceptibil-ity measurements on FeTe_(0.5)Se_(0.5)superconducting long tapes fabricated via reel‐to‐reel pulsed laser deposition.Our transport measurements revealed a high critical current density that remains relatively stable even with increasing external magnetic fields,reaching over 1×10^(5)A/cm^(2)at 8 K and 9 T.The calculated pinning force density indicates that normal point pinning is the primary mechanism in these tapes.The magneto‐optical images demonstrated that the tapes show homogeneous superconductivity and uniform distribution of critical current density.The AC magnetic susceptibility measurements also confirmed their strong flux pinning nature of withstanding high magnetic field.Based on these characteristics,FeTe_(0.5)Se_(0.5)superconducting tapes show promising prospects for applications under high magnetic field.

关 键 词：FeSe_(0.5)Te_(0.5) Coated conductor Flux pinning AC magnetic susceptibility Magneto‐optical imaging 

分 类 号：TB3[一般工业技术—材料科学与工程]