A 57Fe Mössbauer study on the FeSe and Fe(Se,Te) superconductors: Discontinuities in the hyperfine parameters at T c

Johan Kaarle Mikael Lindén, Eeva Leena Rautama, Maarit Karppinen, Hisao Yamauchi

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

Polycrystalline samples of FeSe 0.82 and FeSe 0.5Te 0.5 were synthesized using a solid-state reaction route. Bulk superconductivity was confirmed using SQUID magnetometry. The onset of T c was at 8.0 K for FeSe 0.82 and 12.5 K for FeSe 0.5Te 0.5. Paramagnetic 57Fe Mössbauer spectra were recorded at temperatures between 5.4 and 320 K in transmission geometry. All spectra exhibited simple quadrupole splitting. For FeSe 0.5Te 0.5 a small drop in the quadrupole splitting was observed about T c upon cooling. Additionally, for both samples the isomer shift and the total absorption started to drop around T c, indicating a softening of the lattice. The drop is estimated to correspond to at least 60 K from the original Debye temperatures.

Original languageEnglish
Pages (from-to)133-136
Number of pages4
JournalHyperfine Interactions
Volume208
Issue number1-3
DOIs
Publication statusPublished - Mar 2012
MoE publication typeA1 Journal article-refereed

Keywords

  • Fe Mössbauer spectroscopy
  • Chalcogenide superconductivity
  • Iron-based superconductors

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