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

Published

October 19, 2011

Author(s)

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

Abstract

Recent experiments have shown that reversible effects of strain on the critical current density and flux pinning strength in the high-temperature superconductor Bi₂Sr₂Ca₂Cu₃O_x can be explained entirely by the pressure dependence of its critical temperature. Such a correlation is less simple for RE-Ba₂Cu₃O_7-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-Ba₂Cu₃O_7-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-Ba₂Cu₃O_7-δ. The reversible strain effect in RE-Ba₂Cu₃O_7-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.

Citation

Superconductor Science and Technology

Volume

24

Issue

115010

Pub Type

Journals

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Keywords

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

Citation

van, D. , Abraimov, D. , Polyanskii, A. , Larbalestier, D. , Douglas, J. , Semerad, R. and Bauer, M. (2011), Anisotropic in-plane reversible strain effect in Y_0.5Gd_0.5Ba₂Cu₃O_7-δ coated conductors, Superconductor Science and Technology, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=909164 (Accessed October 10, 2024)