| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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A Modified Lattice Model of the Reversible Effect of Axial Strain on the Critical Current of Polycrystalline REBa2Cu3O7−δ Films |
| GOU Xiao-Fan**, ZHU Guang |
| College of Mechanics and Materials, Hohai University, Nanjing 210098 |
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| Cite this article: |
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GOU Xiao-Fan, ZHU Guang 2015 Chin. Phys. Lett. 32 037401 |
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Abstract The strain effect on the critical current is one of the most important properties for polycrystalline YBa2Cu3O7−δ (REBCO, RE: rare earth) films, in which the reversible effect is intrinsic in the range of strain 0 and the irreversible strain εirr. By introducing the applied strain, a modified lattice model combining the strain and misorientation of grain boundaries (GBs) in the REBCO film is developed. A good agreement of the calculation on the lattice model with the experimental data shows that the lattice model is able to well describe the reversible effect of axial strain on the critical current of the REBCO film, and provides a good understanding of the mechanism of the reversible effect of the strain. Moreover, the effects of the crystallographic texture of the REBCO film and the residual strain εr on the variation of the critical current with the applied strain are extensively investigated. Furthermore, by using the developed lattice model, the irreversible strain εirr of the REBCO film can be theoretically determined by comparing the calculation of the critical current-strain curve with the experimental data.
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Published: 26 February 2015
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| PACS: |
74.72.-h
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(Cuprate superconductors)
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74.78.-w
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(Superconducting films and low-dimensional structures)
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74.25.Ld
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(Mechanical and acoustical properties, elasticity, and ultrasonic Attenuation)
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