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125Te-Mössbauer study of Fe1.1Te and FeTe0.5Se0.5 superconductor

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Abstract

A parent compound of iron-based superconductor, Fe1.1Te, and a Se-doped superconductor, FeTe0.5Se0.5, were investigated using 125Te-Mössbauer spectroscopy. By measuring precise temperature dependence of the spectra, discontinuous line broadening in the Fe1.1Te near the antiferromagnetic transition temperature (TN) of Fe was observed. While the broadening of the line width were observed in both samples as the temperature decreases, the temperature dependences of the line width were well reproduced as that of the recoilless fraction, assuming the Debye model with a Debye temperature of about 200 K. The discontinuous additional line broadening in the Fe1.1Te can be considered as the internal magnetic fields of Te below TN, since the temperature dependence of internal magnetic fields of Te is similar to that of Fe in 57Fe-Mössbauer spectroscopy. Therefore, hybridization of the electronic orbital of Te and Fe was suggested and the transferred magnetic moment of Te was induced through the antiferromagnetic order of Fe at TN.

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Acknowledgements

The author thank Dr. R. Masuda and Dr. M. Saito at Institute for Integrated Radiation and Nuclear Science, Kyoto University for their experimental support and helpful discussion. This work was partly supported by JSPS Grant-in-Aid for Scientific Research Grant nos. 24540371 and 16 K05446. This work has been performed by using facilities of the Institute for Integrated Radiation and Nuclear Science, and Research Center for Low Temperature and Materials Sciences, Kyoto University.

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Authors and Affiliations

  1. Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori Osaka, 590-0494, Japan

    Shinji Kitao, Masayuki Kurokuzu, Yasuhiro Kobayashi & Makoto Seto

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  1. Shinji Kitao
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  2. Masayuki Kurokuzu
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  3. Yasuhiro Kobayashi
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  4. Makoto Seto
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Correspondence to Shinji Kitao.

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This article is part of the Topical Collection on Proceedings of the 5th Mediterranean Conference on the Applications of the Mössbauer Effect (MECAME 2019) and 41st Workshop of the French-speaking Group of Mössbauer Spectroscopy (GFSM 2019), Montpellier, France, 19-23 May 2019

Edited by Pierre-Emmanuel Lippens, Yann Garcia, Moulay-Tahar Sougrati and Mira Ristic (†)

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Kitao, S., Kurokuzu, M., Kobayashi, Y. et al. 125Te-Mössbauer study of Fe1.1Te and FeTe0.5Se0.5 superconductor. Hyperfine Interact 240, 112 (2019). https://doi.org/10.1007/s10751-019-1652-1

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  • DOI: https://doi.org/10.1007/s10751-019-1652-1

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