Magnetic studies of the vortex pinning force in Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+y</sub>
R A Rose; P A J de Groot; S Smith; R A Rose; Southampton Univ., UK; P A J de Groot; Southampton Univ., UK; S Smith; Southampton Univ., UK
Журнал:
Superconductor Science and Technology
Дата:
1992-01-01
Аннотация:
The authors have performed magnetisation measurements on Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+y</sub> and obtained the pinning force Fp=Jc.B at different temperatures as a function of field for sintered pellets and for single crystals. Using the flux creep model they have fitted theoretical curves to the data and obtained the pinning activation energy U and the pinned volume delta <sub>v</sub>. They have performed relaxation measurements and obtained U(B,T), which they have put explicitly into the model.
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