Investigating E-J characteristics of melt-textured YBa2Cu3O7-δ

We studied the E-J characteristics of a melt-textured YBa2Cu3O7-δ sample by measuring its sweeping rate dependence of magnetization with a vibrating sample magnetometer. Firstly, we derived the relationship between the electric field and sweeping rates from flux conservation equation, and furthermore developed a method of obtaining lnE-lnJ curves and thermal excitation potential U0(T,B) from magnetization measurement. Then, curves of lnE-lnJ and U0(T,B) were deduced from the magnetic measurements on a melt-textured YBa2Cu3O7-δ sample prepared by MTG method, and thereby different dynamic behaviors were studied in accordance with our experimental data