Abstract
We report a study of low-energy electronic structure and Fermi surface topology for the recently discovered iron-based superconductor Ca₁₀(Pt₃As₈)(Fe₂As₂)₅(the 10-3-8 phase, with Tc∼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 Pt₃As₈ 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.
Keywords
FS, ARPES, angle-resolved photoemission spectroscopy
Subject Categories
Fermi surfaces, Superconductors
Disciplines
Condensed Matter Physics | Physics
Publisher
American Physical Society
Publication Date
3-20-2012
Rights Information
Copyright (2012) American Physical Society.
Rights Holder
American Physical Society
Recommended Citation
Neupane, Madhab; Liu, Chang; Xu, Su-Yang; Wang, Yung-Jui; Ni, Ni; Allred, J. M.; Alidoust, N.; Lin, Hsin; Markiewicz, R. S.; Bansil, A.; Cava, R. J.; and Hasan, M. Z., "Fermi-surface topology and low-lying electronic structure of the iron-based superconductor Ca₁₀(Pt₃As₈)(Fe₂As₂)₅" (2012). Physics Faculty Publications. Paper 521.
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Notes
Originally published in Physical Review B v.85 (2012): 094510. DOI: