A Modified Lattice Model of the Reversible Effect of Axial Strain on the Critical Current of Polycrystalline REBa2 Cu3 O7−δ Films
GOU Xiao-Fan** , ZHU Guang
College of Mechanics and Materials, Hohai University, Nanjing 210098
Abstract ：The strain effect on the critical current is one of the most important properties for polycrystalline YBa2 Cu3 O7−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 ε r ε irr
出版日期: 2015-02-26
:
74.72.-h
(Cuprate superconductors)
74.78.-w
(Superconducting films and low-dimensional structures)
74.25.Ld
(Mechanical and acoustical properties, elasticity, and ultrasonic Attenuation)
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2015, Vol. 32 
