Noise Properties of (Hg0.9Re0.1)Ba2CaCu2Oy Dc Superconducting Quantum Interference Device on (LaAlO3)0.3-(SrAl0.5Ta0.5O3)0.7 Substrates.

  • Inoue Nobuyoshi
    Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku, Tokyo 135-0062, Japan
  • Tsukamoto Akira
    Advanced Research Laboratory, Hitachi, Ltd., Kokubunji, Tokyo 185-8601, Japan
  • Sugano Tsuyoshi
    Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku, Tokyo 135-0062, Japan
  • Ogawa Akihiro
    Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku, Tokyo 135-0062, Japan
  • Adachi Seiji
    Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku, Tokyo 135-0062, Japan
  • Takagi Kazumasa
    Advanced Research Laboratory, Hitachi, Ltd., Kokubunji, Tokyo 185-8601, Japan
  • Tanabe Keiichi
    Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku, Tokyo 135-0062, Japan

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説明

(Hg0.9Re0.1)Ba2CaCu2Oy ((Hg, Re)-1212) grain-boundary junctions (GBJs) and dc superconducting quantum interference devices (SQUIDs) were fabricated on (LaAlO3)0.3-(SrAl0.5Ta0.5O3)0.7 (LSAT) bicrystal substrates and their electrical properties at 77 K were evaluated. It was confirmed that the GBJs exhibited little excess current and homogeneous current distribution. The 1/ƒ noise of 2× 10-5 Φ0/Hz1/2 at 1 Hz in an ac bias scheme and the white flux noise of 8× 10-6 Φ0/Hz1/2 were obtained. These noise values are substantially lower than that of (Hg, Re)-1212 SQUIDs previously fabricated on SrTiO3 (STO) and comparable to that of SQUIDs made of high-quality YBa2Cu3Oy thin films. This improvment of the flux noise can be attributed to the GBJs on LSAT much more homogeneous than those on STO substrates.

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