where t=T/T<sub>c</sub>. Yeshurun et al. studied the irreversibility line ofYBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> single crystal, and obtained a relation similar...where t=T/T<sub>c</sub>. Yeshurun et al. studied the irreversibility line ofYBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> single crystal, and obtained a relation similar to expression（1）. The authors also obtained a similar relation from Bi<sub>1.7</sub>Pb<sub>0.3</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>y-x</sub>F<sub>x</sub> bulk superconductor, its values of H<sub>0</sub> are different above and below 9550 A/m. Research of Rango et al. on Bi<sub>1.4</sub>Pb<sub>0.6</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>10</sub>展开更多
In the magnetization curve of Tl_4Ba_3Ca_3Cu_4O_y, bulk superconductor, there exists an anomaly of magnetization in the magnetic field lower than H_(Cl). The time dependence of DC magnetization in zero-field-cooled sa...In the magnetization curve of Tl_4Ba_3Ca_3Cu_4O_y, bulk superconductor, there exists an anomaly of magnetization in the magnetic field lower than H_(Cl). The time dependence of DC magnetization in zero-field-cooled sample has been investigated. The experimental result shows that there are giant flux creeps and flux jumps during the flux creep. The magnetization decay rate depends upon both the field and the temperature. The thermal activation of flux lines for U_0≈0.14 eV at 77.3 K is discussed.展开更多
文摘where t=T/T<sub>c</sub>. Yeshurun et al. studied the irreversibility line ofYBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> single crystal, and obtained a relation similar to expression（1）. The authors also obtained a similar relation from Bi<sub>1.7</sub>Pb<sub>0.3</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>y-x</sub>F<sub>x</sub> bulk superconductor, its values of H<sub>0</sub> are different above and below 9550 A/m. Research of Rango et al. on Bi<sub>1.4</sub>Pb<sub>0.6</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>10</sub>
基金Project supported by the National Center for Research and Development of Superconductivity.
文摘In the magnetization curve of Tl_4Ba_3Ca_3Cu_4O_y, bulk superconductor, there exists an anomaly of magnetization in the magnetic field lower than H_(Cl). The time dependence of DC magnetization in zero-field-cooled sample has been investigated. The experimental result shows that there are giant flux creeps and flux jumps during the flux creep. The magnetization decay rate depends upon both the field and the temperature. The thermal activation of flux lines for U_0≈0.14 eV at 77.3 K is discussed.
