A New Superconducting Cuprate Prepared by Low-Temperature Thin-Film Synthesis in a Ba-Cu-O System.

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  • Yamamoto Hideki
    NTT Basic Research Laboratories, 3–1 Morinosato–Wakamiya, Atsugi–shi, Kanagawa 243–01, Japan
  • Naito Michio
    NTT Basic Research Laboratories, 3–1 Morinosato–Wakamiya, Atsugi–shi, Kanagawa 243–01, Japan
  • Sato Hisashi
    NTT Basic Research Laboratories, 3–1 Morinosato–Wakamiya, Atsugi–shi, Kanagawa 243–01, Japan

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Abstract

A new high-T c superconducting cuprate composed of Ba, Cu and O was prepared on SrTiO3(001) substrate by reactive coevaporation. The superconducting phase is formed only in the limited temperature range between 575 and 625° C and in a narrow compositional range. Observations of the X-ray diffraction and transmission electron microscopy suggests that the superconducting phase is the 214-based structure. Superconductivity is obtained only after strong oxidation after film growth. The resistivity measurement shows Tconset≈ 60 to 70 K and T c end=< 38 K and the magnetic measurement shows Tconset≈ 85 to 90 K.

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