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

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

6 Citeringar (Scopus)

Sammanfattning

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.

OriginalspråkEngelska
Sidor (från-till)133-136
Antal sidor4
TidskriftHyperfine Interactions
Volym208
Utgåva1-3
DOI
StatusPublicerad - mar 2012
MoE-publikationstypA1 Tidskriftsartikel-refererad

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