Charge carrier localization induced by excess Fe in the Fe1+y(Te,Se) superconductor system

Details Charge carrier localization induced by excess Fe in the Fe1+y(Te,Se) superconductor system Charge carrier localization induced by excess Fe in the Fe1+y(Te,Se) superconductor system

2009-04-05

arxiv.org/abs/0904.0824v4

Physical Review B 80, 174509 2009

Physics

Condensed Matter

Superconductivity

15 pages, 6 figures accepted for publication in PRB

Scientific paper

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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