Evidence that the reversible strain effect on critical current density and flux pinning in Bi₂Sr₂Ca₂Cu₃O_<i>x</i>tapes is caused entirely by the pressure dependence of the critical temperature

Abstract

It is well known that the critical temperature of cuprate- and iron-based high-temperature superconductors changes with pressure. YBa2Cu3O7 − δ coated conductors, as well as Bi2Sr2CaCu2Ox and Bi2Sr2Ca2Cu3Ox tapes and wires, show a clear reversible effect of strain on their current-carrying capability, but no clear understanding about the origin of this effect has been obtained. For the first time, we present evidence that the pressure dependence of the critical temperature is entirely responsible for a reversible change in critical current and magnetic flux pinning in Bi2Sr2Ca2Cu3Ox tapes with strain.