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Investigation into the superconducting threshold of Bi1.6Pb0.4Sr2Can−1CunO2n+4+δ, n = 2, 2.5, 4 perovskites synthesized by glassy precursor route with Thermal and Raman spectroscopic techniques

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Abstract

Bi1.6Pb0.4Sr2Can−1CunOx perovskites system with n = 2, 2.5, and 4 synthesized through glassy precursor route by melt quenching. It has been found that only one composition of the series (n = 4), exhibited superconducting transition. Analysis by energy dispersive X-ray showed an increase of elemental ratio of Bi in all compositions. Activation energies of crystallization of various compositions are evaluated using thermal analysis and it is found that the activation energy plays a critical role in superconducting transition of these compounds. Structural analysis of the perovskites by XRD revealed a strikingly similar structure for all the compositions irrespective of their superconducting nature, while Raman and SEM revealed slight traces of impurity modes in all the compositions. However the impurity observed thus are minima in the lone composition that exhibited superconducting transition. Here an effort has been made to investigate the reasons for the only one composition of the series exhibiting superconducting transition irrespective of their near uniformity in the structure. It has been found that the presence of residual glass, plumbates and poor inter-grain connectivity formed the detrimental factors that made the two compositions devoid of their superconducting transition.

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Acknowledgments

Sincerely thanks Dr. Vasanth G Sathe, Raman Spectroscopy lab, Dr. Rajeev Rawat, Magneto Transport and Calorimetry Lab, UGC-DAE, CSR Indore, Madhya Pradesh, India for their useful discussion and support for the characterization of the above samples. Also thanks the Scientists at Advanced Material Characterization Division VSCC, Trivandrum, Kerala, India for extending their help to carry out the preparation of the above samples.

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  1. Laboratory for Unconventional Electronics and Photonics, Department of Physics, National Institute of Technology, Calicut, PIN-67360, Kerala, India

    T. Kannan & P. Predeep

  2. Department of Physics, Jawaharlal Nehru Technological University, Hyderabad, PIN-500085, India

    T. Kannan

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  1. T. Kannan
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  2. P. Predeep
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Correspondence to P. Predeep.

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Kannan, T., Predeep, P. Investigation into the superconducting threshold of Bi1.6Pb0.4Sr2Can−1CunO2n+4+δ, n = 2, 2.5, 4 perovskites synthesized by glassy precursor route with Thermal and Raman spectroscopic techniques. J Therm Anal Calorim 114, 635–641 (2013). https://doi.org/10.1007/s10973-012-2845-x

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