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Excess Conductivity Analysis of Y-Ba-Cu–O Superconductor Phases

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Abstract

The excess conductivity analysis of the conductivity data of YBa2Cu3O7-δ, YBa2Cu4O8, and Y2Ba4Cu7O15-δ is carried out for the studies of intrinsic parameters of superconductivity in these compounds to determine the superiority among their homologous phases. The YBa2Cu3O7-δ sample prepared by using CuO has shown oxygen-deficient chains that have given inferior values of coherence length along the c-axis, interlayer coupling, and Fermi velocity of the carriers in comparison with the YBa2Cu3O7-δ sample prepared by Cu2(CN)2 as starting compounds. The YBa2Cu3O7-δ sample synthesized by CuO is, however, superior in their magnetic characteristics in comparison with Cu2(CN)2 synthesized sample, i.e., have higher values of Bc(0) and Bc1. The superior magnetic characteristics of YBa2Cu3O7-δ sample prepared by CuO arise due to higher density of oxygen defects which act as microscopic pinning centers. The normal pressure synthesis of YBa2Cu4O8 sample has been made possible by using Cu2(CN)2 as a starting copper compound. YBa2Cu4O8 sample is also superior to YBa2Cu3O7-δ samples as far as their coherence length along the c-axis and the Fermi velocity of carriers is concerned, but their magnetic characteristics are inferior due to lower population of defects in double Cu2O chains. The Y2Ba4Cu7O15-δ whose unit cell consists of alternating YBa2Cu3O7-δ and YBa2Cu4O8 unit cells shows very high coherence length, penetration depth, and Fermi velocity when compared to the other two phases. However, its magnetic characteristics are inferior. Finally, we have concluded that the superiority trend among these homologous phases for device fabrication is YBa2Cu3O7-δ, > YBa2Cu4O8, > Y2Ba4Cu7O15-δ, respectively.

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Authors and Affiliations

  1. Department of Physics, Materials Science Lab, Quaid-i-Azam University, Islamabad, 45320, Pakistan

    Sadia Firdaus Akhtar, Nawazish A. Khan & Syed Hamza Safeer

  2. Brazilian Center for Research in Physics (CBPF), Rio de Janeiro, RJ, 22290-180, Brazil

    Syed Hamza Safeer

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  1. Sadia Firdaus Akhtar
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Akhtar, S.F., Khan, N.A. & Safeer, S.H. Excess Conductivity Analysis of Y-Ba-Cu–O Superconductor Phases. J Low Temp Phys 206, 106–119 (2022). https://doi.org/10.1007/s10909-021-02629-0

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