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Effect of Ca Substitution on the Superconductivity of La2.5Y0.5CaBa3(Cu0.88Fe0.12)7O z

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Abstract

The structural and superconducting properties of single-phase La2.5−y Y0.5Ca1+y Ba3 (Cu0.88Fe0.12)7O z (LYCaBCuFe) (y= 0.0−1.0) compounds with triple perovskite structure are investigated using X-ray diffraction, resistivity, a.c. susceptibility, and oxygen content measurements. Increasing Ca substitution for La resulted in a decrease in unit cell axes and volume. T R=0c shows a marginal increase from 31 K to 37 K for y = 0.0−0.21 and thereafter it decreases with increasing y leading to zero T R=0c at y ≥ 0.84. This shows that the suppression of T c from 80 K to 31 K by Fe doping at x = 0.12 La2.5Y0.5CaBa3(Cu1−x Fe x )7O z cannot be compensated by appropriate hole doping with Ca in LaYCaBCuFe.

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Authors and Affiliations

  1. Department of Physics, Saurashtra University, Rajkot–, 360 005, India

    M. V. Subbarao, Amish G. Joshi, Nikesh A. Shah, D. G. Kuberkar & R. G. Kulkarni

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  1. M. V. Subbarao
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  2. Amish G. Joshi
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  3. Nikesh A. Shah
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  4. D. G. Kuberkar
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  5. R. G. Kulkarni
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Subbarao, M.V., Joshi, A.G., Shah, N.A. et al. Effect of Ca Substitution on the Superconductivity of La2.5Y0.5CaBa3(Cu0.88Fe0.12)7O z . Journal of Superconductivity 11, 673–676 (1998). https://doi.org/10.1023/A:1022620518584

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  • DOI: https://doi.org/10.1023/A:1022620518584

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