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      https://www.ias.ac.in/article/fulltext/pram/037/06/0525-0538

    • Keywords

       

      Irreversibility line; AC and DC magnetization techniques; type-I and type-II superconductors

    • Abstract

       

      A comparison has been made of irreversibility temperature determined by four different methods in few specimens of lead (type-I) and niobium (type-II). The merger ofMZFC(T) andMFC(T) curves giveTr(H) values lower than those evident from vanishing the hysteresis in isothermal DC magnetization. The identification of peak temperature inx″H(T) data withTr(H) is appropriate only if the contribution from changes in the normal state electrodynamics can be isolated and the peak is narrow. The appearance of differential paramagnetic effect inx′H(T) data is adequate to imply reversibility, however, its efficacy to precisely locate irreversibility line remains to be established.

    • Author Affiliations

       

      A K Grover1 2 S Ramakrishnan3 Ravi Kumar3 P L Paulose3 S K Malik3 P Chaddah4

      1. Department of Physics, Panjab University, Chandigarh - 160 014, India
      2. Institute of Fundamental Research, Bombay - 400 005, India
      3. Tata Institute of Fundamental Research, Bombay - 400 005, India
      4. Solid State Physics Division, Bhabha Atomic Research Centre, Bombay - 400 085, India

    • Dates

       
      Published
      December 1991
      Manuscript received
      1 July 1991

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