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    • Orthorhombic structure: a necessity in superconducting 1-2-3 compounds

      R Prakash O Prakash N S Tavare

      Rapid Communications Volume 30 Issue 6 June 1988 pp 1-

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    • Keywords

       

      High temperature superconductivity; YBa2Cu3O7−δ; orthorhombic structure

    • Abstract

       

      X-ray and resistivity measurements on YBa2Cu3O7−δ(1-2-3) samples show that for the same but low oxygen concentration,δ⋍0·55, no superconducting transition down to 4·2 K is observed for the tetragonal phase samples while the orthorhombic phase shows aTc ∼ 31 K. The effect of oxygen concentration onTc is isolated.Tc=91±1 K has, however, been observed continuously for the normal oxygen annealed samples,δ⋍0·07. The experimental results suggest strongly the necessity of the 1-2-3 compound to be in the orthorhombic phase for the superconducting mechanism to be operative.

    • Author Affiliations

       

      R Prakash1 2 O Prakash1 N S Tavare1 3

      1. Materials Science Centre, Powai, Bombay - 400 076, India
      2. Department of Physics, Indian Institute of Technology, Powai, Bombay - 400 076, India
      3. Institute of Science & Technology, University of Manchester, Manchester - M60 1QD, England

    • Dates

       
      Published
      June 1988
      Manuscript received
      10 March 1988

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