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2012 | 121 | 4 | 726-729
Article title

Interplay Between Spin Density Wave and Superconductivity in `122' Iron Pnictides: ^{57}Fe Mössbauer Study

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EN
Abstracts
EN
Iron-based superconductors Ba_{0.7}Rb_{0.3}Fe_{2}As_{2} and CaFe_{1.92}Co_{0.08}As_{2} of the `122' family have been investigated by means of the 14.41-keV Mössbauer transition in ^{57}Fe versus temperature ranging from the room temperature till 4.2 K. A comparison is made with the previously investigated parent compounds BaFe_{2}As_{2} and CaFe_{2}As_{2}. It has been found that Mössbauer spectra of these superconductors are composed of the magnetically split component due to development of spin density wave and non-magnetic component surviving even at lowest temperatures. The latter component is responsible for superconductivity. Hence, the superconductivity occurs in the part of the sample despite the sample is single phase. This phenomenon is caused by the slight variation of the dopant concentration across the sample (crystal).
Keywords
EN
Contributors
  • Mössbauer Spectroscopy Division, Institute of Physics, Pedagogical University, PL-30-084 Kraków, ul. Podchorążych 2, Poland
  • Mössbauer Spectroscopy Division, Institute of Physics, Pedagogical University, PL-30-084 Kraków, ul. Podchorążych 2, Poland
author
  • Department of Solid State Physics, AGH University of Science and Technology, A. Mickiewicza 30 Av., PL-30-059 Kraków, Poland
author
  • Institute of Low Temperatures and Structure Research, Polish Academy of Sciences, PL-50-422 Wrocław, ul. Okólna 2, Poland
author
  • Institute of Low Temperatures and Structure Research, Polish Academy of Sciences, PL-50-422 Wrocław, ul. Okólna 2, Poland
author
  • Laboratory for Solid State Physics, ETH Zurich, CH-8093 Zurich, Switzerland
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv121n4p102kz
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