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Stoichiometry Analysis and Normal-State Properties of SmBa2Cu3−x Ru x O7−δ Superconducting Phase

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An Erratum to this article was published on 21 December 2015

Abstract

The electrical resistivity of normal and superconducting states for SmBa2Cu3−x Ru x O7−δ (Sm-123) phase with 0.00 ≤ x ≤ 0.50, prepared by the conventional solid-state reaction technique, was studied. X-ray powder diffraction (XRD), scanning electron microscope (SEM), particle-induced X-ray emission (PIXE), Rutherford backscattering spectroscopy (RBS) and electrical resistivity measurements were performed in order to investigate the effect of Ru4+ ions substitution in Sm-123 phase. Both the phase formation and superconducting transition temperature T c enhance up to x = 0.05. For x > 0.05, suppression of both the phase formation and T c is observed and the superconductivity is completely destroyed around x = 0.50. The normal-state electrical resistivity was analyzed by the two- and three-dimensional variable range hopping (2D-VRH and 3D-VRH) and Coulomb gap CG. The dominant mechanism for Sm-123 phase is CG with x ≤ 0.20 while is 3D-VRH for x ≥ 0.30.

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Acknowledgments

This work was performed in the Superconductivity and Metallic-Glass Lab, Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt. The authors are grateful for the support of Accelerator Laboratory, Lebanese Atomic Energy Commission, CNRS, Beirut, Lebanon for PIXE and RBS measurements.

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Authors and Affiliations

  1. Physics Department, Faculty of Science Alexandria University, Alexandria, Egypt

    M. ME. Barakat & A. I. Abou-Aly

  2. Physics Department, Faculty of Science Beirut Arab University, Beirut, Lebanon

    R. Awad

  3. Accelerator Laboratory, Lebanese Atomic Energy Commission National Council for Scientific Research, Airport Road, PO Box 11, 8281, Beirut, Lebanon

    M. Roumié

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  1. M. ME. Barakat
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  2. R. Awad
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  3. A. I. Abou-Aly
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  4. M. Roumié
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Correspondence to M. ME. Barakat.

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Barakat, M.M., Awad, R., Abou-Aly, A.I. et al. Stoichiometry Analysis and Normal-State Properties of SmBa2Cu3−x Ru x O7−δ Superconducting Phase. J Supercond Nov Magn 29, 289–300 (2016). https://doi.org/10.1007/s10948-015-3263-7

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  • DOI: https://doi.org/10.1007/s10948-015-3263-7

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