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Fermi surface topology and low-lying electronic structure of a new iron-based superconductor Ca10(Pt3As8)(Fe2As2)5

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arxiv 1110.4687 v1 pith:I65USQY7 submitted 2011-10-21 cond-mat.supr-con cond-mat.str-el

M. Neupane , Chang Liu , S.-Y. Xu , Y. J. Wang , N. Ni , J. M. Allred , L.A. Wray , H. Lin
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R.S. Markiewicz A. Bansil R.J. Cava M.Z. Hasan
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classification cond-mat.supr-concond-mat.str-el
keywords structurefermiiron-basedlayerspt3as8superconductorarpesca10
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We report a first 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 = 8K), 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 arising from the Pt3As8 intermediary layers, these results indicate that those layers couple only weakly to the FeAs layers in this new superconductor, which has implications for the determination of its potentially novel pairing mechanism.

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  1. Preformed Cooper Pairs in a Triclinic Iron Pnictide Superconductor

    cond-mat.supr-con 2025-01 conditional novelty 6.0 of 10

    In a triclinic iron pnictide superconductor, a spin resonance precursor, Nernst signal, and NMR density-of-states reduction all point to preformed Cooper pairs persisting to T* = 45 K, above Tc = 30 K.

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