Strain-controlled critical temperature in REBa2Cu3Oy-coated conductors.

Awaji, Satoshi; Suzuki, Takumi; Oguro, Hidetoshi; Watanabe, Kazuo; Matsumoto, Kaname

Awaji, Satoshi; Suzuki, Takumi; Oguro, Hidetoshi; Watanabe, Kazuo; Matsumoto, Kaname.

Afiliación

Awaji S; High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University.
Suzuki T; High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University.
Oguro H; High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University.
Watanabe K; High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University.
Matsumoto K; Kyusyu Institute for Technology.

Sci Rep ; 5: 11156, 2015 Jun 11.

Article en En | MEDLINE | ID: mdl-26063123

RESUMEN

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.

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2015 Tipo del documento: Article Pais de publicación: Reino Unido

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