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Effect of Ag Addition on Microstructure and Raman Vibrational Modes of Bulk FeSe

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Abstract

We have synthesized polycrystalline bulk FeSe materials with various Ag concentrations through double-sintering solid-state reaction. All the samples exhibited similar onset critical temperature of around 8 K. Atomic force microscopic observation revealed that the grain connectivity was improved through Ag addition. Raman spectroscopic studies confirmed that pristine and Ag-doped FeSe compounds have superconducting tetragonal structure with high crystalline quality. There was a clear red shift and peak broadening in Fe-related Raman modes when the Ag concentration is increased, which might be ascribed to the incorporation of Ag+ ions into the FeSe lattice. The critical current density decreased with Ag addition, although onset critical temperature remained constant.

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Acknowledgments

The paper was supported by the Japan Student Services Organization (JASSO), Shibaura Institute of Technology (SIT), under the Top Global University Project, designed by the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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Authors and Affiliations

  1. Nano Functional Materials Technology Centre and Materials Science Research Centre, Department of Physics, Indian Institute of Technology Madras, Chennai, 600036, India

    K. Fabitha & M. S. Ramachandra Rao

  2. Superconducting Materials Laboratory, Graduate School of Science and Engineering, Shibaura Institute of Technology, Tokyo, 135-8548, Japan

    M. Muralidhar, K. Furutani & M. Murakami

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  1. K. Fabitha
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  2. M. S. Ramachandra Rao
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  3. M. Muralidhar
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  4. K. Furutani
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Correspondence to M. Muralidhar.

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Fabitha, K., Ramachandra Rao, M.S., Muralidhar, M. et al. Effect of Ag Addition on Microstructure and Raman Vibrational Modes of Bulk FeSe. J Supercond Nov Magn 30, 3117–3122 (2017). https://doi.org/10.1007/s10948-017-4117-2

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  • DOI: https://doi.org/10.1007/s10948-017-4117-2

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