Critical Current Density,Vortex Pinning,and Phase Diagram in the NaCl-Type Superconductors InTe1-xSex(x=0,0.1,0.2)

• Published in: 中国物理快报（英文版） Vol. 40; no. 3; pp. 49 - 55
• Main Authors: Linchao Yu, Song Huang, Xiangzhuo Xing, Xiaolei Yi, Yan Meng, Nan Zhou, Zhixiang Shi, Xiaobing Liu
• Format: Journal Article
• Language: English
• Published: School of Physics and Physical Engineering,Qufu Normal University,Qufu 273165,China%School of Physics and Physical Engineering,Qufu Normal University,Qufu 273165,China 2023; Advanced Research Institute of Multidisciplinary Sciences,Qufu Normal University,Qufu 273165,China%College of Physics and Electronic Engineering,Xinyang Normal University,Xinyang 464000,China%Department of Physics,Jining University,Qufu 273155,China%Key Laboratory of Materials Physics,Institute of Solid State Physics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China%School of Physics,Southeast University,Nanjing 211189,China
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/40/3/037403

Research of vortex properties in type-Ⅱ superconductors is of great importance for potential applications and fundamental physics.Here,we present a comprehensive study of the critical current density Jc,vortex pinning,and phase diagram of NaCl-type InTe1-xSex(x=0,0.1,0.2)superconductors synthesized by high-pressure technique.Our studies reveal that the values of Jc calculated by the Bean model exceed 104 A/cm2 in the InTe1-xSex system,signifying good potential for applications.The magnetic hysteresis loops(MHLs)show an asymmetric characteristic at various degrees,which is associated with the surface barrier.Intriguingly,a rare phenomenon in which the second magnetization peak in the MHLs occurs only in the field-descending branch is detected in InTe0 .9Se0.1.Such an anomalous behavior has not been observed before and can be described by considering the respective roles of the surface barrier and bulk pinning in the field-ascending and field-descending branches.By analyzing the pinning force density versus reduced field,the pinning mechanisms are studied in detail in the framework of the Dew-Hughes model.Finally,combining the results of resistivity and magnetization measurements,the vortex phase diagrams are constructed and discussed.