高T_c超导体YBCO磁通钉扎的计算机模拟研究  

COMPUTER SIMULATIAN OF FLUX PINNING IN THE HIGH TEMPERATURE SUPERCONDUCTORS YBCO

作　　者：刘利锋[1] 

机构地区：[1]重庆大学数理学院加底达(美)-重庆大学超导研究所,重庆400044

出　　处：《低温物理学报》2009年第1期68-71,共4页Low Temperature Physical Letters

摘　　要：临界电流密度Jc是影响高温超导体在强电领域应用的一个重要参数,在实际应用中,特别在外加磁场下,临界电流密度与超导材料的磁通钉扎性质密切相关.因此,磁通钉扎一直是高温超导体研究中的一个重要领域.由于高温超导体磁通钉扎力密度FP的标度律存在,本文根据D.Dew-Hughes总结的钉扎力函数,主要存在两种主要作用类型(正常相和Δκ).我们将D.Dew-Hughes给出的钉扎力密度FP标度函数改进为一个简化的具有物理意义的函数表达式.结合文献中已有的实验数据,我们对YBCO进行了计算机模拟,确定了它的磁通钉扎类型,模拟的研究结果与实际情况比较吻合.The critical current density Jc is an important parameter in the applied field of the strong electricity in the high-temperature superconductors. In practical applications, especially in the external magnetic field, the critical current density have closely related to flux pinning of the superconducting materials. So, flux pinning mechanism is a important research field in the high-temperature superconductors. The scaling law of magnetic flux pinning density exists in the high-temperature superconductor. There are two types of the pinning force （normal phase and △K） which D. Dew-Hughes summed up. We will improve the scaling function of pinning density Fp to a simplified function expression according to the pinning of the density scale given by D. Dew-Hughes. In accordance with the experimental data of references, We give a computer simulation for YBCO to determine its flux pinning type. The results of simulation proves to be consistent with the conclusion of the references.

关 键 词：高温超导体 D.Dew—Hughes理论 钉扎力标度 计算机模拟 

分 类 号：O511.4[理学—低温物理]