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Fobes, D.
in Cooperation with on an Cooperation-Score of 37%
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article
From (π,0) magnetic order to superconductivity with (π,π) magnetic resonance in Fe1.02Te1-xSex
Abstract
The iron chalcogenide Fe<sub>1+y </sub>(Te<sub>1-<i>x</i></sub>Se<i><sub>x </sub></i>) is structurally the simplest of the Fe-based superconductors<sup>1–3</sup>. Although the Fermi surface is similar to iron pnictides<sup>4,5</sup>, the parent compound Fe<sub>1+y</sub>Te exhibits antiferromagnetic order with an in-plane magnetic wave vector (π,0) (ref. 6). This contrasts the pnictide parent compounds where the magnetic order has an in-plane magnetic wave vector (π,π) that connects hole and electron parts of the Fermi surface<sup>7,8</sup>. Despite these differences, both the pnictide and chalcogenide Fe superconductors exhibit a superconducting spin resonance around (π,π) (refs 9-11). A central question in this burgeoning field is therefore how (π,π) superconductivity can emerge from a (π,0) magnetic instability<sup>12</sup>. Here, we report that the magnetic soft mode evolving from the (π,0)-type magnetic long-range order is associated with weak charge carrier localization. Bulk superconductivity occurs as magnetic correlations at (π,0) are suppressed and the mode at (π, π) becomes dominant for <i>x</i>>0.29. Our results suggest a common magnetic origin for superconductivity in iron chalcogenide and pnictide superconductors.