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Normal-state Conduction Mechanisms in GdBa2Cu3−x Ru x O7−δ Superconducting Phase

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Abstract

Bulk superconducting samples of type GdBa2Cu3−x Ru x O7−δ , Gd-123, with x=0.0–0.3 were prepared by the conventional solid-state reaction technique. X-ray powder diffraction (XRD), scanning electron microscope (SEM), electron dispersive X-ray (EDX) and electrical-resistivity measurements were performed in order to investigate the effect of Ru4+ ions substitution on Gd-123 phase. Enhancement of both phase formation and the superconducting transition temperature T c for GdBa2Cu3−x Ru x O7−δ phase up to x=0.05 was observed from XRD and electrical-resistivity measurement, respectively. This enhancement was confirmed with the calculated relative volume fraction. For x>0.05, suppression of both phase formation and T c was obtained and the superconductivity was completely destroyed around x=0.3. 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 results showed that the dominant mechanism was CG for x≤0.075, while was 3D-VRH for x≥0.15.

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Authors and Affiliations

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

    R. Awad, A. I. Abou-Aly, S. A. Mahmoud & M. ME. Barakat

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

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Awad, R., Abou-Aly, A.I., Mahmoud, S.A. et al. Normal-state Conduction Mechanisms in GdBa2Cu3−x Ru x O7−δ Superconducting Phase. J Supercond Nov Magn 24, 2227–2236 (2011). https://doi.org/10.1007/s10948-011-1187-4

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