The effect of temperature on pinning mechanisms in HTS composites

2nd Conference on Plasma & Laser Research and Technologies

Sotnikova, A.P.^1 ; Rudnev, I.A.^1,2

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe sh. 31, Moscow

115409, Russia^1

International Laboratory of High Magnetic Fields and Low Temperatures', Gajowicka 95, Wroclaw

53-421, Poland^2

关键词: Effect of temperature;    High temperature superconductor (HTS);    Magnetization curves;    Pinning mechanism;    Second generation;    Temperature increase;    Temperature range;    Vibration sample magnetometers;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/747/1/012047/pdf
DOI  :  10.1088/1742-6596/747/1/012047

来源: IOP

【 摘 要 】

Pinning mechanism in samples of second generation tapes (2G) of high-temperature superconductors (HTS) was studied The critical current and the pinning force were calculated from the magnetization curves measured in the temperature range of 4.2 - 77 K in magnetic fields up to 14 Tesla using vibration sample magnetometer. To determine the pinning mechanism the dependences of pinning force on magnetic field were constructed according to the Dew-Hughes model and Kramer's rule. The obtained dependences revealed a significant influence of the temperature on effectiveness of different types of pinning. At low temperatures the 2G HTS tapes of different manufacturers demonstrated an equal efficiency of the pinning centers but with temperature increase the differences in pinning mechanisms as well as in properties and effectiveness of the pinning centers become obvious. The influence of the pinning mechanism on the energy losses in HTS tapes was shown.