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Iron isotope effect on the superconducting transition temperature and the crystal structure of FeSe<sub>1โ<i>x</i></sub>
The Fe isotope effect (Fe-IE) on the transition temperature Tc and the crystal structure was studied in the Fe chalcogenide superconductor FeSe1โx by means of magnetization and neutron powder diffraction (NPD). The substitution of natural Fe (containing โ92% of 56Fe) by its lighter 54Fe isotope leads to a shift in โฆ