Charge-carrier localization induced by excess Fe in the superconductor Fe1+yTe1−xSex

By Tijiang Liu, Xianglin Ke, B. Qian, Jin Hu, D. Fobes, E. Vehstedt, H. Pham, Jian-Jian Yang, Minghu Fang, L. Spinu and 3 more. 2009

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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.

Subfields: Accounting, Electronic, Optical and Magnetic Materials, Strategy and Management

View Paper: https://www.semanticscholar.org/paper/f688a777207a31d6a68aa37f2b79512f2285621f