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Recently, we succeeded in detwinning REBa 2 Cu 3 O 7  (RE123, RE = rare-earth elements)-coated conductors by annealing under an external uniaxial strain. Using the untwinned RE123 tapes, the uniaxial-strain dependencies of the critical temperature  T  c  along the  a  and  b  crystal axes were investigated over a wide strain region from compression to tension. We found that the strain dependencies of  T  c  for the  a  and  b  axes obey a power law but exhibit opposite slopes. In particular, the maximum value of  T  c  is obtained when the CuO 2  plane becomes a square, and its lattice constant is close to 0.385 nm. It is suggested that a tetragonal structure with  a  ≈ 0.385 nm is the optimum condition for a high critical temperature in high- T  c  cuprates.

Strain-controlled critical temperature in REBa2Cu3Oy-coated conductors