Numerical analysis of magnetization of HgBa$_2Ca_2Cu_3O_{8+{\delta}}$ superconductor

HgBa_2Ca_2Cu_3O_{8+{\delta}}$ 초전도체 자화의 수치적 해석

Magnetization measurements have been carried out on grain aligned Hg-1223 with the applied field parallel to the c-axis. The temperature dependence of the lower critical field H$_{cl}$(T) was determined by considering the effect of the surface barrier on the magnetization. H$_{cl}$(T) have been determined .from magnetic hysteresis loops within the framework of the modified Kim-Anderson critical-state model, where the surface barrier and the lower critical field are explicitly considered. At high temperature, H$_{cl}$(T) is identified as H$_p$(T). This results are agreed with the theory of Bean-Livinston surface barriers.