Charge carrier localization induced by excess Fe in the Fe1+y(Te,Se) superconductor system
T.J. Liu, X. Ke, B. Qian, J. Hu, D. Fobes, E. K. Vehstedt, H. Pham,, J.H. Yang, M.H. Fang, L. Spinu, P. Schiffer, Y. Liu, and Z.Q. Mao
TL;DR
This study explores how excess Fe in Fe1+y(Te,Se) superconductors causes charge carrier localization and suppresses superconductivity through magnetic interactions, revealing the role of interstitial Fe in electronic and magnetic properties.
Contribution
It demonstrates that interstitial Fe induces localization and weakens superconductivity via magnetic coupling, providing new insights into the effects of nonstoichiometry in Fe-based superconductors.
Findings
Excess Fe suppresses superconductivity.
Interstitial Fe causes charge carrier localization.
Magnetic coupling leads to short-range magnetic order.
Abstract
We have investigated the effect of Fe nonstoichiometry on properties of the Fe1+y(Te, Se) superconductor system by means of resistivity, Hall coefficient, magnetic susceptibility, and specific heat measurements. We find that the excess Fe at interstitial sites of the (Te, Se) layers not only suppresses superconductivity, but also results in a weakly localized electronic state. We argue that these effects originate from the magnetic coupling between the excess Fe and the adjacent Fe square planar sheets, which favors a short-range magnetic order.
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