【摘要】 本文探讨利用交流磁化率研究超导电性.测量了MgB2样品的若干超导电参量,包括临界温度Tc,上临界磁场Hc2,临界电流密度Jc,不可逆场Hirr等与温度的关系,交流损耗与频率和温度的关系等.此外还简要介绍了交流磁化率在磁通动力学和非线性性质方面的研究方法.更多还原

【Abstract】 This paper described how to study superconductivity by ac susceptibility(acs) measurements. Different acs curves of MgB2 samples, such as critical temperature Tc, upper critical magnetic field Hc2, critical current density Jc, irreversible magnetic field Hirr and ac losses Q, were measured by a home-made acs apparatus. We introduced briefly the physical background to study flux dynamics and non-linear properties of superconductors by acs method as well.更多还原