Iron isotope effect on the superconducting transition temperature and the crystal structure of FeSe1-x
Abstract
The Fe isotope effect (Fe-IE) on the transition temperature Tc and the crystal structure was studied in the Fe chalcogenide superconductor FeSe1-x by means of magnetization and neutron powder diffraction (NPD). The substitution of natural Fe (containing 92% of 56Fe) by its lighter 54Fe isotope leads to a shift of Tc of 0.22(5)K corresponding to an Fe-IE exponent of αFe=0.81(15). Simultaneously, a small structural change with isotope substitution is observed by NDP which may contribute to the total Fe isotope shift of Tc.
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