Observation of lattice softening at Tc in the FeSe 0.5Te0.5 superconductor

J. Lindén*, J. P. Libäck, M. Karppinen, E. L. Rautama, H. Yamauchi

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)

Abstract

Polycrystalline samples of FeSe0.5Te0.5 were synthesized using a conventional solid-state reaction method. The onset of bulk superconductivity transition was confirmed by SQUID magnetometry at 12.5 K. 57Fe Mssbauer spectra in transmission geometry were recorded at temperatures between 6.0 and 320 K. Both the isomer shift and the total absorption started to drop about Tc, indicating a softening of the lattice. The drop is estimated to correspond to at least 60 K from the original Debye temperature θD≈460 K. Seebeck measurements indicate that the samples are n-type conductors at low temperatures with a cross-over to p-type conductivity around 135 K. The zero Seebeck coefficient is seen below 10.6 K.

Original languageEnglish
Pages (from-to)130-134
Number of pages5
JournalSolid State Communications
Volume151
Issue number2
DOIs
Publication statusPublished - Jan 2011
MoE publication typeA1 Journal article-refereed

Keywords

  • A. Pnictide superconductors
  • D. Lattice softening
  • E. Fe Mssbauer spectroscopy
  • E. Hyperfine interactions

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