Why $T_c$ of (CaFeAs)${}_{10}$Pt${}_{3.58}$As${}_8$ is twice as high as (CaFe${}_{0.95}$Pt${}_{0.05}$As)${}_{10}$Pt${}_3$As${}_8$

Abstract

Recently discovered (CaFe${}_{1-x}$Pt${}_x$As)${}_{10}$Pt${}_3$As${}_8$ and (CaFeAs)${}_{10}$Pt${}_{4-y}$As${}_8$ superconductors are very similar materials having the same elemental composition and structurally similar superconducting FeAs slabs. Yet the maximal critical temperature achieved by changing Pt concentration is approximately twice higher in the latter. Using angle-resolved photoemission spectroscopy(ARPES) we compare the electronic structure of their optimally doped compounds and find drastic differences. Our results highlight the sensitivity of critical temperature to the details of fermiology and point to the decisive role of band-edge singularities in the mechanism of high-$T_c$ superconductivity.

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• Pseudogap from ARPES experiment: three gaps in cuprates and topological superconductivity
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• Interaction-induced singular Fermi surface in a high-temperature oxypnictide superconductor
• Incipient antiferromagnetism in the Eu-doped topological insulator Bi${}_2$Te${}_3$
• Superconductivity and Dirac Fermions in 112-phase Pnictides
• Electronic band structure of optimal superconductors: from cuprates to ferropnictides and back again
• Superconducting properties and pseudogap from preformed Cooper pairs in the triclinic (CaFe${}_{1-x}$Pt${}_x$As)${}_{10}$Pt${}_3$As${}_8$
• Field-induced nematic-like magnetic transition in an iron pnictide superconductor, Ca${}_{10}$(Pt${}_3$As${}_8$)((Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$)${}_5$
• Lattice distortion and stripe-like antiferromagnetic order in Ca10(Pt3As8)(Fe2As2)5
• Unfolding the electronic structure of Ca${}_{10}$(Fe${}_{1-x}$Pt${}_x$As)${}_{10}$(Pt${}_n$As${}_8$)
• Optical properties of the optimally doped Ca${}_{8.5}$La${}_{1.5}$(Pt${}_3$As${}_8$)(Fe${}_2$As${}_2$)${}_5$ single crystal
• Effect of impurity substitution on band structure and mass renormalization of the correlated FeTe${}_{0.5}$Se${}_{0.5}$ superconductor
• The Hidden Nematic Fluctuations in the Triclinic (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 Superconductor Revealed by Ultrafast Optical Spectroscopy
• Coexistence of Bloch electrons and glassy electrons in Ca10(Ir4As8)(Fe2_xIrxAs2)5 revealed by angle-resolved photoemission spectroscopy
• Direct observation of spin-orbit coupling in iron-based superconductors
• Superconductivity on the verge of electronic topological transition in Fe based superconductors
• Nodeless superconducting gaps in Ca${}_{10}$(Pt${}_{4-\delta }$As${}_8$)((Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$)${}_5$ probed by quasiparticle heat transport