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    • Keywords


      Y-based superconductor; magnetoresistivity; activation energy; coherence length.

    • Abstract


      Y3Ba5Cu8O18 (Y-358) and Y3Ba5Ca2Cu8O18 (YCa-358) compounds were prepared by the so-called sol–gel method. The effect of doping Ca atoms into the Y3Ba5Cu8O18 superconductor is studied by employing the electrical resistivity measurements at various magnetic fields. The possible degradation in microstructural and superconducting properties due to the addition of Ca was discussed. The resistivity as a function of temperature measurements shows that the depression in superconducting temperature is more pronounced for both samples. A systematic analysis of the magnetoresistivity of the Y-358 and YCa-358 compounds has been carried out by using the thermally activated flux flow (TAFF) model. The TAFF activation energy, 𝑈, is field dependent and obeys the power law 𝑈 = 𝑐𝐻–𝛼, where 𝛼 increases while 𝑐 decreases with the addition of Ca. Furthermore, 𝑈 and the calculated upper critical field, 𝐻𝑐2, decrease with the addition of Ca.

    • Author Affiliations


      Mustafa Akyol1 Ali Osman Ayaş2 Gönül Akça1 Selda Kiliç Çeti̇n1 Ahmet Eki̇ci̇bi̇l1

      1. Department of Physics, Faculty of Sciences and Letters, Çukurova University, 01330 Adana, Turkey
      2. Department of Physics, Faculty of Sciences and Letters, Adıyaman University, 02040 Adıyaman, Turkey
    • Dates

  • Bulletin of Materials Science | News

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      Posted on July 25, 2019

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