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Published July 17, 2009 | Published
Journal Article Open

Fermi Surface Topology and Low-Lying Quasiparticle Dynamics of Parent Fe_(1+x)Te/Se Superconductor

Abstract

We report the first photoemission study of Fe_(1+x) Te—the host compound of the newly discovered iron-chalcogenide superconductors (maximum T_c∼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 Fe_(1+x)Te series is different from the undoped phases of the high Tc pnictides and likely harbor an unusual mechanism for superconductivity and magnetic order.

Additional Information

© 2009 The American Physical Society. Received 16 January 2009. Published 13 July 2009. We thank P.W. Anderson, B. A. Bernevig, D. A. Huse, D.-H. Lee, Y. Ran, Z. Tesanovic, A. Vishwanath, and C. Xu for discussions. The synchrotron x-ray experiments at ALS/LBNL are supported by the U.S. DOE-BES (Contract No. DE-FG02-05ER46200) and materials growth supported by NSFC and CAS China.

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August 20, 2023
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