Comparison of Electromechanical Properties and Lattice Distortions of Different Cuprate High-Temperature Superconductors

The electromechanical properties of different cuprate high temperature superconductors, notably two ReBCO tapes, a reinforced and a non-reinforced Bi-2223 tape and a Bi-2212 wire have been studied. The axial tensile stress and strain, as well as the transverse compressive stress limits at which an irreversible critical current degradation occurs are compared. The experimental set-up has been integrated in a high energy synchrotron beamline and the self-field critical current and lattice parameter changes as a function of tensile stress and strain of a reinforced Bi-2223 tape have been measured simultaneously. Initially the Bi-2223 filaments exhibit nearly linear elastic behavior up to the strain at which an irreversible degradation is observed. At 77 K an axial Bi-2223 filament pre-compression of 0.09% in the composite tape and a Bi-2223 Poisson ratio ν =0.21 have been determined.