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      https://www.ias.ac.in/article/fulltext/boms/014/03/0691-0695

    • Keywords

       

      Oxide superconductors; Tc suppression; 151Eu Mössbauer

    • Abstract

       

      151Eu Mössbauer studies have been performed on the compounds EuBa2(Cu1−xZnx)3O7−y withx=0·0, 0·025, 0·05, 0·075 and 0·1. The parent compound, EuBa2Cu3O7−y is superconducting with a transition temperature (Tc) of 88 K.Tc is depressed as Zn is substituted for Cu in this system and the compounds withx>0·05 do not show superconductivity down to 12 K.151Eu Mössbauer studies at 295 K show a single Mössbauer line in all the compounds (whether superconducting or not) with isomer shift value typical of Eu3 + ion. Further, the isomer shift values are nearly independent ofx and the temperatures down to 10 K. These observations imply that the Cu-O network responsible for superconductivity is very weakly coupled to the Eu sublattice.

    • Author Affiliations

       

      C V Tomy1 R Nagarajan1 S K Malik1 Ram Prasad1 2 N C Soni1 2 Kalyan Adhikary1 2

      1. Tata Institute of Fundamental Research, Bombay - 400 005, India
      2. Bhabha Atomic Research Centre, Bombay - 400 085, India
    • Dates

       
  • Bulletin of Materials Science | News

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