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EPR Studies of Tl0.5Pb0.5Sr1.6Ba0.4CaCu2−x Ru x O7−δ Superconductor

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Abstract

Bulk superconducting samples of type Tl0.5Pb0.5Sr1.6Ba0.4CaCu2−x Ru x O7−δ, (Tl, Pb)/Sr-1212, with 0.0 ≤ x ≤ 0.525 were prepared by the conventional one-step solid-state reaction technique. The prepared samples were investigated using X-ray powder diffraction, electrical resistivity and electron paramagnetic resonance (EPR) measurements. Enhancement of the phase formation, superconducting transition temperature T c and hole carriers concentration P was observed up to x = 0.075. For x > 0.075, a reverse trend was observed. EPR spectra were measured at different temperatures (120–290 K) for all prepared samples. The number of spins N participating in the resonance and the paramagnetic susceptibility χ were calculated as a function of both Ru-content and temperature. N and χ increased as the Ru-content increased. A linear relationship between logN and 1/T was established, from which the activation energy E a was calculated as a function of the Ru-content. The temperature dependence of χ was fitted according to Curie–Weiss type of magnetic behavior. Curie constant C, Curie temperature θ, the effective magnetic moment μ and the electronic specific heat γ were estimated as a function of the Ru-content.

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Acknowledgments

We express our gratitude to the Superconductivity and Metallic-Glass Laboratory, Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt, for aiding with the experimental procedures. Special thanks to National Research Center, Egypt, for EPR measurements.

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Authors and Affiliations

  1. Physics Department, Faculty of Science, Alexandria University, Moharam Bek, Alexandria, 21511, 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. EPR Studies of Tl0.5Pb0.5Sr1.6Ba0.4CaCu2−x Ru x O7−δ Superconductor. Appl Magn Reson 41, 79–93 (2011). https://doi.org/10.1007/s00723-011-0245-1

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