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

Xia, Y. and Qian, D. and Wray, L. and Hsieh, D. and Chen, G. F. and Luo, J. L. and Wang, N. L. and Hasan, M. Z. (2009) Fermi Surface Topology and Low-Lying Quasiparticle Dynamics of Parent Fe_(1+x)Te/Se Superconductor. Physical Review Letters, 103 (3). Art. No. 037002. ISSN 0031-9007. doi:10.1103/PhysRevLett.103.037002.

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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.

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Hsieh, D.0000-0002-0812-955X
Alternate Title:Fermi Surface Topology and Low-Lying Quasiparticle Dynamics of Parent Fe(1+x)Te/Se Superconductor
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.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-05ER46200
Chinese Academy of Sciences (CAS)UNSPECIFIED
Natural Science Foundation of China (NSFC)UNSPECIFIED
Issue or Number:3
Classification Code:PACS numbers: 74.70.b, 74.25.Jb, 79.60.i
Record Number:CaltechAUTHORS:20140828-183436105
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49034
Deposited By: Joy Painter
Deposited On:29 Aug 2014 20:33
Last Modified:10 Nov 2021 18:39

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