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Formation and superconductivity of Pr and Nd-substituted Tl-1212 phase Tl0.85Cr0.15)Sr2CaCu2O7

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Abstract

The derivatives of Tl-1212 type phase superconductors with nominal starting compositions Tl0.85Cr0.15)Sr2(Ca1-xRx)Cu2O7 where R = Pr or Nd (Ca series) together with Tl0.85Cr0.15)Sr2(Ca1-xRx)Cu2O7 (Sr series) for x = 0 − 0.5 have been prepared and investigated by d.c. electrical resistance and powder X-ray diffraction analyses. Partial substitution of Ca with Pr or Nd has the advantage of stabilizing the tetragonal phase with space group P4/mmm but suppressed the onset critical temperature Tc onset. The Ca series generally showed a higher Tc onset than the Sr series. The importance of ionic radius of the substituted elements and the effects of starting composition on Tc onset and phase formation are discussed.

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Authors and Affiliations

  1. Department of Physics, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor Darul Ehsan, Malaysia

    R. Abd-Shukor & Nor azah nik Jaafar

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  1. R. Abd-Shukor
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  2. Nor azah nik Jaafar
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Abd-Shukor, R., Jaafar, N.a.n. Formation and superconductivity of Pr and Nd-substituted Tl-1212 phase Tl0.85Cr0.15)Sr2CaCu2O7 . Journal of Materials Science: Materials in Electronics 10, 677–681 (1999). https://doi.org/10.1023/A:1008994704163

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