Abstract
Recently, we succeeded in detwinning REBa2Cu3O7 (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 Tc 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 Tc for the a and b axes obey a power law but exhibit opposite slopes. In particular, the maximum value of Tc is obtained when the CuO2 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-Tc cuprates.
Highlights
V CuBe spring beam special spring[5,10]
We report the wide range of the uniaxial-strain dependence of Tc using detwinned coated conductors and discuss the role of the lattice distortion on Tc in the RE123 system
Detwinning is routinely performed for Y123 single crystals
Summary
V CuBe spring beam special spring[5,10]. a serious experimental issue related to the use of RE123 coated conductors is the mixture of a and b axis domains due to the existence of twin boundaries. Because of the coexistence of different crystal-axis domains, it is considered that the strain dependency of Jc of RE123-coated conductors is very complicated[5]. We report the wide range of the uniaxial-strain dependence of Tc using detwinned coated conductors and discuss the role of the lattice distortion on Tc in the RE123 system.
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