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.Attached Files
Published - PhysRevLett.103.037002.pdf
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Additional details
- Alternative title
- Fermi Surface Topology and Low-Lying Quasiparticle Dynamics of Parent Fe(1+x)Te/Se Superconductor
- Eprint ID
- 49034
- Resolver ID
- CaltechAUTHORS:20140828-183436105
- DE-FG02-05ER46200
- Department of Energy (DOE)
- Chinese Academy of Sciences (CAS)
- Natural Science Foundation of China (NSFC)
- Created
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2014-08-29Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field