期刊
NATURE MATERIALS
卷 9, 期 9, 页码 716-720出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT2800
关键词
-
类别
资金
- NSF [DMR-0645305, DMR-0454672]
- DOE [DE-FG02-07ER46358, DE-FG02-08ER46544]
- DARPA [HR 0011-09-1-0047]
- Deutsche Forschungsgemeinschaft [SPP 1458, AR 613/1-2]
The iron chalcogenide Fe1+y(Te1-xSex) is structurally the simplest of the Fe-based superconductors(1-3). Although the Fermi surface is similar to iron pnictides(4,5), the parent compound Fe1+y Te exhibits antiferromagnetic order with an in-plane magnetic wave vector (pi,0) (ref. 6). This contrasts the pnictide parent compounds where the magnetic order has an in-plane magnetic wave vector (pi,pi) that connects hole and electron parts of the Fermi surface(7,8). Despite these differences, both the pnictide and chalcogenide Fe superconductors exhibit a superconducting spin resonance around (pi,pi) (refs 9-11). A central question in this burgeoning field is therefore how(pi,pi) superconductivity can emerge from a (pi,0) magnetic instability(12). Here, we report that the magnetic soft mode evolving from the (pi,0)-type magnetic long-range order is associated with weak charge carrier localization. Bulk superconductivity occurs as magnetic correlations at (pi,0) are suppressed and the mode at (pi,pi) becomes dominant for x > 0.29. Our results suggest a common magnetic origin for superconductivity in iron chalcogenide and pnictide superconductors.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据