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    • Thermal expansion of orthorhombic and tetragonal phases of the highTc superconductors RE1Ba2Cu3Oy (RE=Y, Gd, Dy)

      O M Prakash Ashok Rao O Prakash P N Dheer

      Research Articles Volume 41 Issue 5 November 1993 pp 421-428

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/041/05/0421-0428

    • Keywords

       

      Thermal expansion; high temperature superconductors; discontinuity in α; growth conditions; iodometric titration

    • Abstract

       

      Measurements of the coefficient of linear thermal expansion α have been carried out for the orthorhombic and tetragonal phases of RE1Ba2Cu3Oy(RE=Y, Gd, Dy) compounds using a high resolution capacitance dilatometer in the temperature range 77–300 K. All the superconducting samples exhibit a jump Δα at their respective transition temperatures,Tc. Evidences of, sample-to-sample variation in α values and dependence of Δα on the sample preparation conditions, have been obtained. The non-superconducting samples, in general, exhibit lower values of α possibly because of lowering of oxygen content.

    • Author Affiliations

       

      O M Prakash1 Ashok Rao1 O Prakash1 2 P N Dheer1

      1. Department of Physics and Astrophysics, University of Delhi, Delhi - 110 007, India
      2. Materials Science Division, Indian Institute of Technology, Bombay - 400 076, India

    • Dates

       
      Published
      November 1993
      Manuscript received
      29 March 1993
      Manuscript revised
      2 July 1993

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