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Phys. Rev. Lett. 103, 037002 (2009) [4 pages]

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

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Y. Xia1, D. Qian1,2, L. Wray1,3, D. Hsieh1, G. F. Chen4, J. L. Luo4, N. L. Wang4, and M. Z. Hasan1,5,*
1Joseph Henry Laboratories of Physics, Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
2Department of Physics, Shanghai Jiao Tong University, Shanghai 200030, China
3Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94305, USA
4Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
5Princeton Center for Complex Materials, Princeton University, Princeton, New Jersey 08544, USA

Received 16 January 2009; published 13 July 2009

See accompanying Physics Viewpoint

We report the first photoemission study of Fe1+xTe—the host compound of the newly discovered iron-chalcogenide superconductors (maximum Tc∼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=(π/2,π/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.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.037002
DOI:
10.1103/PhysRevLett.103.037002
PACS:
74.70.−b, 74.25.Jb, 79.60.−i

*To whom correspondence should be addressed.

mzhasan@Princeton.edu

 
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