Fermi-surface topology and low-lying electronic structure of the iron-based superconductor Ca 10(Pt 3As 8)(Fe 2As 2) 5

Madhab Neupane, Chang Liu, Su Yang Xu, Yung Jui Wang, Ni Ni, J. M. Allred, L. A. Wray, N. Alidoust, Hsin Lin, R. S. Markiewicz, A. Bansil, R. J. Cava, M. Z. Hasan

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Abstract

We report a study of low-energy electronic structure and Fermi surface topology for the recently discovered iron-based superconductor Ca 10(Pt 3As 8)(Fe 2As 2) 5 (the 10-3-8 phase, with T c∼8 K), via angle-resolved photoemission spectroscopy (ARPES). Despite its triclinic crystal structure, ARPES results reveal a fourfold symmetric band structure with the absence of Dirac-cone-like Fermi dots (related to magnetism) found around the Brillouin zone corners in other iron-based superconductors. Considering that the triclinic lattice and structural supercell arise from the Pt 3As 8 intermediary layers, these results indicate that those layers couple only weakly to the FeAs layers in this new superconductor at least near the surface, which has implications for the determination of its pairing mechanism.

Original languageEnglish (US)
Article number094510
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number9
DOIs
StatePublished - Mar 20 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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