Abstract
We have found that (Ba, K)Fe2As2 superconductor (a transition temperature, Tc∼38K) shows an inverse Iron isotope effect (αFe=−0.18±0.03, where Tc∼M−αFe and M is the iron isotope mass), i.e. the sample containing the larger iron mass depicts higher Tc. Systematic studies using three types of Fe-isotopes (54Fe, natural Fe and 57Fe) reveal a clear inverse shift on Tc by measurements of temperature dependent magnetization and resistivity. The inverse isotope effect that is the first case in high-Tc superconductors strongly suggests that superconducting mechanism of the iron-based system is not explained by conventional BCS theory mediated by phonons.
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