Model of Reversible Strain Dependences of Critical Current in YBCO-based Coated Conductors and Epitaxial PLD Films

Abstract

Reversible strain dependencies of critical current Jc in YBCO coated conductors and epitaxial PLD films are nonlinear, non-monotonous and have two peaks in a certain range of applied field in a contrary to quasi-linear asymmetric reversible dependence in BiSCO films. We have developed a new theoretical model, which takes into account a twin domain structure of YBCO and the anisotropy of uniaxial strain dependence of Tc. Many experimentally observed effects, such as temperature, magnetic field and two-peak strain dependences of Jc, are shown to be described in the framework of suggested model.