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Mössbauer Investigation of Superconductors LaFeO 0.85F 0.15As and High-Temperature Kondo Effect

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Abstract

We report the results of investigation of high-temperature superconductor (HTSC) LaFeO (1−x)F x As at x = 0.15. We applied the XRD method, the measurement of the hysteresis curve and resistivity, as well as the Mössbauer measurements at the temperature range 4.2–300 K. We show that in the given sample, owing to doping by fluorine, full suppression of antiferromagnetism is not accompanied by the rise of superconductivity. Instead, we observe a high-temperature (at T ≤ 40 K) Kondo effect, which indicates a strong coupling of electron’s spins with the magnetic moments of impurities. We also find a correlation between the revealed high-temperature Kondo effect and the appearance of a quadrupole splitting in the Mössbauer spectra below 40 K. The revealed effects can shed light on the mechanism of superconductivity in the iron-containing HTSC.

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Authors and Affiliations

  1. St.-Petersburg Institute of Nuclear Physics, St.-Petersburg, Russia

    A. V. Alduschenkov, O. V. Geraschenko & I. S. Okunev

  2. Belarusian State University, Minsk, Belarus

    A. L. Kholmetskii, V. A. Lomonosov & L. V. Mahnach

  3. Palacky University, Olomouc, Czech Republic

    M. Mashlan & J. Tucek

  4. Okan University, Istanbul, Akfirat, Turkey

    T. Yarman

Authors
  1. A. V. Alduschenkov
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  2. O. V. Geraschenko
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  3. A. L. Kholmetskii
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  4. V. A. Lomonosov
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  5. L. V. Mahnach
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  6. M. Mashlan
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  7. I. S. Okunev
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  8. J. Tucek
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  9. T. Yarman
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Correspondence to A. L. Kholmetskii.

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Alduschenkov, A.V., Geraschenko, O.V., Kholmetskii, A.L. et al. Mössbauer Investigation of Superconductors LaFeO 0.85F 0.15As and High-Temperature Kondo Effect. J Supercond Nov Magn 27, 1825–1829 (2014). https://doi.org/10.1007/s10948-014-2531-2

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  • DOI: https://doi.org/10.1007/s10948-014-2531-2

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