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Phys Rev Lett. 2009 Jul 17;103(3):037002. Epub 2009 Jul 13.

Fermi surface topology and low-lying quasiparticle dynamics of parent Fe1+xTe/Se superconductor.

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1
Joseph Henry Laboratories of Physics, Department of Physics, Princeton Center for Complex Materials, Princeton University, Princeton, New Jersey 08544, USA.

Abstract

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

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