The Effect of Zn-Doping on the Magnetic Field Induced Dimensional Crossover in YBa<sub><b> 2</b></sub>Cu<sub><b> 4</b></sub>O<sub><b> 8</b></sub>

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  • Waku Kiminori
    Institute for Solid State Physics, University of Tokyo, 7–22–1 Roppongi, Minato–ku, Tokyo 106–8666
  • Hussey Nigel E.
    Department of Physics, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
  • Sakai Fumiko
    Institute for Solid State Physics, University of Tokyo, 7–22–1 Roppongi, Minato–ku, Tokyo 106–8666
  • Nohara Minoru
    Institute for Solid State Physics, University of Tokyo, 7–22–1 Roppongi, Minato–ku, Tokyo 106–8666
  • Takagi Hidenori
    Institute for Solid State Physics, University of Tokyo, 7–22–1 Roppongi, Minato–ku, Tokyo 106–8666 Department of Advanced Materials Science, University of Tokyo, 7–3–1 Hongo, Bunkyo–ku, Tokyo 113–8656
  • Nakagawa Hiroyuki
    Institute for Solid State Physics, University of Tokyo, 7–22–1 Roppongi, Minato–ku, Tokyo 106–8666
  • Miura Noboru
    Institute for Solid State Physics, University of Tokyo, 7–22–1 Roppongi, Minato–ku, Tokyo 106–8666
  • Adachi Seiji
    Superconductivity Research Laboratory, International Superconductivity Technology Center, Shinonome 1–10–13, Koto–ku, Tokyo 135–0062

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タイトル別名
  • The Effect of Zn-Doping on the Magnetic Field Induced Dimensional Crossover in YBa2Cu4O8.
  • Effect of Zn-Doping on the Magnetic Field Induced Dimensional Crossover in YBa2Cu4O8

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抄録

In YBa2Cu4O8 (Y124), the c-axis resistivity ρc(T) shows a drastic change from metallic to insulating behavior above a crossover magnetic field Bcr ( B // a ), namely a magnetic field induced dimensional crossover. A simple picture for quasi-1-dimensional (quasi-1D) band transport along the CuO chains, originally proposed by Gorkov and Lebed, was suggested as the mechanism for this novel phenomenon. To further test the proposed picture, similar measurements on Y124 crystals doped with Zn were performed. Zn-doping is found to alter significantly ρc(T) at low temperatures but has little effect on the magnetic field induced dimensional crossover. These results are in good agreement with the predictions of the quasi-1D chain model and appear to confirm the critical role of the CuO chains in metallizing the c-axis in Y124.

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