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Two Mixed Superconducting Phases in (Hg, Re)-1223 Ceramics

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Abstract

We investigate Hg 0.82Re 0.18Ba 2Ca 2Cu 3O 8.76 polycrystalline samples with an optimum oxygen content aimed to analyze both their granular composition and to measure their magnetic response. We find out that the sample corresponds to a solid solution of two intrinsic structural superconductor phases. The AC magnetic susceptibility of a powder sample with a particle size of 20 μm have a critical temperature at 133 K. To make mesoscopic-scale particles of 600 nm in size, a sample of the powder was crushed and sieved. Now, the AC magnetic sample susceptibility shows two critical temperatures at 133 and 98 K. They have been described adopting a particular parametrization of the complex scalar field associated with the order parameter in a new framework of the Ginzburg–Landau theory. Thus, we propose a microscopic model to describe the dynamical interaction between these two types of grains.

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Acknowledgments

We are grateful to CAPES and CNPq for financial support. We also thank Companhia Vale do Rio Doce (CVRD), Companhia Siderúgica de Tubarão (ArcelorMittal). We gratefully acknowledge the National Light Synchrotron Laboratory (LNLS) of Brazil (XRD, XAS, and DXAS). Dr Passos would like to thank FAPES (#63925915/2013) for financial support. JSEO would like to thank the support of the Goiás Research Foundation - FAPEG.

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Authors and Affiliations

  1. Universidade Federal do Espírito Santo, Av. Fernando Ferrari 514, Vitória, ES 29075-910, Brazil

    F. H. S. Eleuterio, L. S. Amorim, H. Belich, M. T. D. Orlando & C. A. C. Passos

  2. Centro Brasileiro de Pesquisas Físicas (CBPF), Coordenação de Física Experimental de Altas Energias (LAFEX), Rua Dr. Xavier Sigaud 150, Rio de Janeiro, RJ 22290-180, Brazil

    H. Belich & C. A. C. Passos

  3. Departamento de Física, Universidade Federal de Goiás, Catalão, Catalão, Goiás, 75704/020, Brazil

    J. S. Espinoza Ortiz

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  1. F. H. S. Eleuterio
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  2. L. S. Amorim
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  3. H. Belich
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  4. M. T. D. Orlando
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  5. C. A. C. Passos
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Correspondence to H. Belich.

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Eleuterio, F.H.S., Amorim, L.S., Belich, H. et al. Two Mixed Superconducting Phases in (Hg, Re)-1223 Ceramics. J Supercond Nov Magn 27, 2679–2684 (2014). https://doi.org/10.1007/s10948-014-2768-9

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  • DOI: https://doi.org/10.1007/s10948-014-2768-9

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