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Anisotropic in-plane reversible strain effect in Y0.5Gd0.5Ba2Cu3O7-δ coated conductors



Daniel C. van der Laan, Dmytro Abraimov, A A. Polyanskii, David C. Larbalestier, J. F. Douglas, R. Semerad, M Bauer


Recent experiments have shown that reversible effects of strain on the critical current density and flux pinning strength in the high-temperature superconductor Bi2Sr2Ca2Cu3Ox can be explained entirely by the pressure dependence of its critical temperature. Such a correlation is less simple for RE-Ba2Cu3O7-δ (RE = rare earth) superconductors, in part because the in-plane pressure dependence of its critical temperature is highly anisotropic. Here, we make a qualitative correlation between the uniaxial pressure dependence of the critical temperature and the reversible strain effect on the critical current of RE-Ba2Cu3O7-δ coated conductors by taking the crystallography and texture of the superconducting film into account. The strain sensitivity of the critical current is highest when strain is oriented along the [100] and [010] directions of the superconducting film, whereas the critical current becomes almost independent of strain when strain is oriented along the [110] direction. The results confirm the important role of the anisotropic pressure dependence of the critical temperature on the reversible strain behavior of RE-Ba2Cu3O7-δ. The reversible strain effect in RE-Ba2Cu3O7-δ is expected to decrease the performance of the conductor in many applications, such as high-field magnets, but the effect may be only minor in coated conductor cables, where strain is generally not aligned with the tape axia.
Superconductor Science and Technology


high-temperature superconductors, critical current, strain effect, strain orientation


van, D. , Abraimov, D. , Polyanskii, A. , Larbalestier, D. , Douglas, J. , Semerad, R. and Bauer, M. (2011), Anisotropic in-plane reversible strain effect in Y<sub>0.5</sub>Gd<sub>0.5</sub>Ba<sub>2</sub>Cu<sub>3</sub>O<sub>7-&#948;</sub> coated conductors, Superconductor Science and Technology, [online], (Accessed December 1, 2023)
Created October 19, 2011, Updated February 19, 2017