Fermi Surface Topology and Low-Lying Quasiparticle Dynamics of Parent Fe1+xTe/Se Superconductor

被引：167

作者：

Xia, Y. ^{[1
]}

Qian, D. ^{[1
,2
]}

Wray, L. ^{[1
,3
]}

Hsieh, D. ^{[1
]}

Chen, G. F. ^{[4
]}

Luo, J. L. ^{[4
]}

Wang, N. L. ^{[4
]}

Hasan, M. Z. ^{[1
,5
]}

机构：

[1] Princeton Univ, Dept Phys, Joseph Henry Labs Phys, Princeton, NJ 08544 USA

[2] Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200030, Peoples R China

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94305 USA

[4] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China

[5] Princeton Univ, Princeton Ctr Complex Mat, Princeton, NJ 08544 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.103.037002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first photoemission study of Fe1+xTe-the host compound of the newly discovered iron-chalcogenide superconductors (maximum T-c similar to 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 T-c pnictides and likely harbor an unusual mechanism for superconductivity and magnetic order.

引用

页数：4

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