Inverse iron isotope effect in FeSe0.35Te0.65

Y. Tsuge, A. Iyo, Y. Tanaka, H. Eisaki, T. Nishio

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


We study an iron isotope effect of FeSe1-xTex (x=0.65) polycrystalline samples with three types of iron isotopes (54Fe, natural Fe, and 57Fe) which were synthesized carefully in order to rule out differences in the Te content x between them. Our estimate of an isotope coefficient αFe defined by -dlnTc/dlnM, where Tc and M are the superconducting transition temperature and the iron isotope mass, is -0.54(1). Measurements of powder x-ray diffraction (XRD) show no significant difference in lattice parameters between the samples. These indicate that compositionally wellcontrolled FeSe1-xTex may possess inverse iron isotope coefficients.

Original languageEnglish
Pages (from-to)731-734
Number of pages4
JournalPhysics Procedia
Publication statusPublished - 2012
EventSuperconductivity Centennial Conference, SCC 2011 - The Hague, Netherlands
Duration: 18 Sep 201123 Sep 2011


  • Fe-based superconductor
  • Isotpe effect
  • Nonconventional mechanism
  • Phonon mechanism
  • Pnictides


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