About: Mössbauer investigation of superconductors LaFeO0.85F0.15As and high-temperature Kondo effect     Goto   Sponge   NotDistinct   Permalink

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  • We report the results of investigation of hightemperature superconductor (HTSC) LaFeO(1?x)FxAs 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 4.2-300K.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.
  • We report the results of investigation of hightemperature superconductor (HTSC) LaFeO(1?x)FxAs 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 4.2-300K.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. (en)
Title
  • Mössbauer investigation of superconductors LaFeO0.85F0.15As and high-temperature Kondo effect
  • Mössbauer investigation of superconductors LaFeO0.85F0.15As and high-temperature Kondo effect (en)
skos:prefLabel
  • Mössbauer investigation of superconductors LaFeO0.85F0.15As and high-temperature Kondo effect
  • Mössbauer investigation of superconductors LaFeO0.85F0.15As and high-temperature Kondo effect (en)
skos:notation
  • RIV/61989592:15310/14:33151453!RIV15-MSM-15310___
http://linked.open...avai/riv/aktivita
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  • I
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  • 8
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http://linked.open...aciTvurceVysledku
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  • 30585
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  • RIV/61989592:15310/14:33151453
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  • Iron-containing superconductors, Mössbauer spectroscopy, Kondo effect (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • US - Spojené státy americké
http://linked.open...ontrolniKodProRIV
  • [79BDB5009C56]
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  • Journal of Superconductivity and Novel Magnetism
http://linked.open...in/vavai/riv/obor
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  • 27
http://linked.open...iv/tvurceVysledku
  • Tuček, Jiří
  • Mašláň, Miroslav
  • Alduschenkov, A.
  • Geraschenko, O.
  • Kholmetskii, A.
  • Lomonosov, V.
  • Mahnach, L.
  • Okunev, I.
  • Yarman, T.
http://linked.open...ain/vavai/riv/wos
  • 000339882200006
issn
  • 1557-1939
number of pages
http://bibframe.org/vocab/doi
  • 10.1007/s10948-014-2531-2
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  • 15310
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