Abstract
The results of the Fe isotope effect (Fe–IE) on the transition temperature T c obtained up to date in various Fe-based high temperature superconductors are summarized and reanalyzed by following the approach developed in [R. Khasanov, M. Bendele, A. Bussmann-Holder, H. Keller, Phys. Rev. B 82, 212505 (2010)]. It is demonstrated that the very controversial results for Fe–IE on T c are caused by small structural changes occurring simultaneously with the Fe isotope exchange. The Fe–IE exponent on T c [α Fe = − (ΔT c /T c )/(ΔM/M), M is the isotope mass] needs to be decomposed into two components with the one related to the structural changes (\( {\alpha}_{Fe}^{str} \)) and the genuine (intrinsic one, \( {\alpha}_{Fe}^{int} \)). The validity of such decomposition is further confirmed by the fact that \( {\alpha}_{Fe}^{int} \) coincides with the Fe–IE exponent on the characteristic phonon frequencies \( {\alpha}_{Fe}^{\mathrm{ph}} \) as is reported in recent EXAFS and Raman experiments.
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Acknowledgments
The author acknowledges the broad and successful collaboration with people without whom this work could not be performed: Markus Bendele, Hugo Keller, Annette Bussmann-Holder, Kazimierz Conder, Ekaterina Pomjakushina, and Volodya Pomjakushin. The special thank goes to Karl Alex Müller and Hugo Keller who were initiated my interest to the isotope effect studies.
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Khasanov, R. (2017). Isotope Effect on the Transition Temperature T c in Fe-Based Superconductors: The Current Status. In: Bussmann-Holder, A., Keller, H., Bianconi, A. (eds) High-Tc Copper Oxide Superconductors and Related Novel Materials. Springer Series in Materials Science, vol 255. Springer, Cham. https://doi.org/10.1007/978-3-319-52675-1_12
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