Correlation between in-plane grain orientation and the reversible strain effect on flux pinning in RE-Ba2Cu3O7-δ coated conductors

Published

December 16, 2011

Author(s)

Daniel C. van der Laan, Loren F. Goodrich, Fraser Douglas, R. Semerad, M Bauer

Abstract

The pressure dependence of the critical temperature causes a reversible effect of strain on the critical current density and flux pinning strength in many high-temperature superconductors. Recent experiments on patterned coated conductor bridges have shown that the anisotropic nature of the pressure dependence of the critical temperature of RE-Ba₂Cu₃O_7-δ (RE = rare earth) has a major impact on the performance of coated conductors under strain, where the strain effect on the critical current density is most prominent when strain is applied along the [100] and [010] directions of the superconducting film, while it almost completely disappears when strain is applied along [110]. Here we investigate the correlation between the pressure dependence of the critical temperature and the reversible strain effect on flux pinning in RE-Ba₂Cu₃O_7-δ coated conductors. We show that axial strain has a large effect on the irreversibility field and the pinning force, in coated conductors that are aligned with the [100] and [010] directions of the superconducting film along the conductor axis. The magnitude of the strain effect in these conductors depends largely on the angle at which the magnetic field is applied. On the other hand, the critical temperature is not expected to change with axial strain in coated conductors that are aligned with the [110] direction along the conductor axis. Indeed, the irreversibility field and the magnetic field dependence of the pinning force of these conductors are independent of axial strain, for all angles at which the magnetic field is applied. Although a minor strain dependence of the critical current that is not caused by a change in critical temperature exists in these conductors, the results confirm that the reversible strain effect in RE-Ba₂Cu₃O_7-δ coated conductors largely determined by the pressure dependence of the critical temperature.

Citation

IEEE Transactions on Applied Superconductivity

Pub Type

Journals

Keywords

High-temperature superconductors, strain effect, critical current, pinning

Citation

van, D. , Goodrich, L. , Douglas, F. , Semerad, R. and Bauer, M. (2011), Correlation between in-plane grain orientation and the reversible strain effect on flux pinning in RE-Ba₂Cu₃O_7-δ coated conductors, IEEE Transactions on Applied Superconductivity (Accessed April 18, 2024)