Critical current and flux pinning near Tc of a YBa2Cu3O7 thin film
Qiu, X. G. ; Cui, C. G. ; Li, S. L. ; Liu, M. X. ; Li, J. ; Zhang, Y. Z. ; Zhao, Y. Y. ; Xu, P. ; Li, L. ; Chen, L. F. ; Chen, P. F. ; Li, N. ; Liu, G. T.
[S.l.] : American Institute of Physics (AIP)
Published 1991
[S.l.] : American Institute of Physics (AIP)
Published 1991
| ISSN: |
1089-7550
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|---|---|
| Source: |
AIP Digital Archive
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| Topics: |
Physics
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| Notes: |
The voltage V versus current I of a high-quality YBa2Cu3O7−x thin film with zero-resistance temperature equal to 90.8 K was measured at temperatures near Tc (85, 87, and 90 K, respectively) under different magnetic fields (0–7 T). A significant result is that the critical-current density of the film reached 1.37×104 A/cm2 (zero field) even at 90 K, implying that strong pinning centers exist in our sample. However, a small applied magnetic field will diminish the critical-current densities remarkably. The pinning-force densities are found to follow Kramer's scaling law in both perpendicular and parallel directions of the magnetic fields to the c axis of the film. A possible influence of thermally activated flux creep on the pinning mechanism is confirmed.
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| Type of Medium: |
Electronic Resource
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| URL: |