临界电流密度的分布对高温超导体中传输交流损耗的影响  

EFFECT OF CRITICAL-CURRENT DENSITY DISTRIBUTIONS ON TRANSPORT AC LOSSES IN HIGH-TEMPERATURE SUPERCONDUCTORS

作　　者：赵玉峰[1] 李世荣[1] 何天虎[1] 

机构地区：[1]兰州理工大学理学院,兰州730000

出　　处：《低温物理学报》2010年第6期465-471,共7页Low Temperature Physical Letters

摘　　要：基于Norris方程和Bean临界态模型,假定临界电流密度沿高温超导圆柱体半径的非均匀分布方式,从定量的角度研究了临界电流密度沿高温超导圆柱体径向分布方式的不同对传输交流损耗的影响.考虑临界电流密度沿径向的包括阶梯式和逐点变化式等多种分布方式,通过引进表征超导体内临界电流密度非均匀分布的强弱差异程度的无量纲参数λ推导出临界电流密度非均匀分布方式下高温超导体中传输交流损耗的解析表达式.结果表明临界电流密度阶梯式分布对损耗的影响和临界电流密度逐点变化式分布的情况在损耗曲线的变化趋势和量级上有明显的区别并且随着传输电流的增加临界电流密度的非均匀分布方式对传输损耗的影响也越显著.Based on Norris equations and bean model,several non-uniform distributions of critical-current density were assumed,the effect of distributions of critical-current density along the radial direction of high-temperature superconductors on transport ac losses was investigated from the quantitative point of view.Multi-distributions of critical-current density along the radial direction included stepwise and point-to-point were considered and analytical expressions of transport ac losses under non-uniform distributions of critical-current density by introducing a dimensionless parameter λ which characterized the discrepancy of non-uniform distributions of critical-current density.The results indicated that there are obvious differences between stepwise and point-to-point at the curves trend and the order of magnitude.The higher the transport current increase,the obviously the effect of non-uniform distributions of critical-current density on transport ac losses become.

关 键 词：交流损耗 临界电流密度 临界态模型 高温超导体 

分 类 号：O511.4[理学—低温物理]