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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/045/0207

    • Keywords

       

      High pressure; transport property; Bi-2212; Bi-2223; superconductivity; density of states.

    • Abstract

       

      Transport measurements were performed on over-doped samples of pristine and Pb-substituted Bi–Sr–Ca–Cu–O as a function of applied pressure up to 7 GPa. A monotonic decrease in the superconducting transition temperature accompanied by a change in the normal-state behaviour from metallic to semiconducting as a function of pressure is observed in the pristine sample. In the Pb-substituted sample, a monotonic decrease in the superconducting transition temperature up to ${\sim}$4.5 GPa followed by an increase after attaining a valley is observed. The pressure required to achieve this increase in T$_C$ in the Pb-substituted Bi–Sr–Ca–Cu–O was found to be much lower than that reported in the literature. High-pressure X-ray diffraction measurements performed on these samples reveal the absence of any structural phase transition. Furthermore, the values of the bulk moduli are found to increase in the Pb-substituted sample. The density functional theory calculations used to substantiate the obtained results indicate a pressure-induced buckling of the Cu–O plane in the Bi-2212 phase of the pristine sample. In the Pb-substituted sample, an increase in the number of electronic states available for conduction at the Fermi level and a pressure-dependent increase in the contribution of Pb towards the density of states are revealed from the calculations of the density functional theory.

    • Author Affiliations

       

      V GAYATHRI1 2 A T SATHYANARAYANA1 2 BALMUKUND SHUKLA1 T GEETHA KUMARY1 N R SANJAY KUMAR1 2 SHARAT CHANDRA1 2

      1. Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
      2. Homi Bhabha National Institute, Training School Complex, Mumbai 400094, India

    • Dates

       
      Published
      19 October 2022
      Manuscript received
      14 May 2022
      Accepted
      27 June 2022
      Final version published online
      19 October 2022

  • Bulletin of Materials Science | News

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