Fermi surface topology and low-lying quasiparticle dynamics of parent Fe1+xTe/Se superconductor.
Fermi surface topology and low-lying quasiparticle dynamics of parent Fe1+xTe/Se superconductor.
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DOI：
10.1103/physrevlett.103.037002
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发表时间：
2009-01
影响因子：
8.6
通讯作者：
Y. Xia;D. Qian;L. Wray;D. Hsieh;G. Chen;J. Luo;N. L. Wang;M Zahid Hasan
中科院分区：
文献类型：
--
作者：
Y. Xia;D. Qian;L. Wray;D. Hsieh;G. Chen;J. Luo;N. L. Wang;M Zahid Hasan
我们报告了 Fe1+xTe 的首次光电子发射研究，Fe1+xTe 是新发现的铁硫属化物超导体的主体化合物（最大 Tc 约为 27 K）。我们的结果揭示了一对几乎电子空穴补偿的费米口袋、强费米速度重整化以及不存在自旋密度波隙。在布里渊区的“X”点处观察到阴影孔袋，这与长程有序磁结构基态一致。没有观察到与 Q=(pi/2,pi/2) 相关的费米表面嵌套不稳定性的特征。我们的结果共同表明，Fe1+xTe 系列与高 Tc 磷族元素的未掺杂相不同，并且可能具有不寻常的超导和磁序机制。
We report the first photoemission study of Fe1+xTe-the host compound of the newly discovered iron-chalcogenide superconductors (maximum Tc approximately 27 K). Our results reveal a pair of nearly electron-hole compensated Fermi pockets, strong Fermi velocity renormalization, and an absence of a spin-density-wave gap. A shadow hole pocket is observed at the "X" point of the Brillouin zone which is consistent with a long-range ordered magnetostructural ground state. No signature of Fermi surface nesting instability associated with Q=(pi/2,pi/2) is observed. Our results collectively reveal that the Fe1+xTe series is different from the undoped phases of the high Tc pnictides and likely harbor an unusual mechanism for superconductivity and magnetic order.