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    • Keywords


      High temperature superconductivity; Bi-Sr-Ca-Cu-O; X-ray diffraction; multiple phase

    • Abstract


      Starting composition 1112 for Bi-Sr-Ca-Cu-oxide yields multiphase super-conductors with the proportion of constituent phases depending sensitively on the annealing temperature. The R-T curves show zero resistivity and the transition corresponding toTc = 80 K phase prominently. However, indexing of X-ray diffraction peaks reveals presence of 80 K (lowTc) as well as 108 K (highTc) phase. The lowTc phase thus corresponds to the orthorhombic structure with a unit cell ofa = 5.4Å,b = 27 Å andc = 30.56 Å. This is further understood to be composed of a pseudotetragonal cell ofa =b = 5.41 Å. The highTc phase similarly pertains to the orthorhombic structure withc = 36 Å.

    • Author Affiliations


      N D Kataria1 Mukesh Kumar1 V S Tomar1 V N Ojha1 G S N Reddy1 K C Nagpal1 A K Gupta1

      1. National Physical Laboratory, Dr K S Krishnan Road, New Delhi - 110 012, India
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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