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Weak-coupling superconductivity in a strongly correlated iron pnictide.
Charnukha, A; Post, K W; Thirupathaiah, S; Pröpper, D; Wurmehl, S; Roslova, M; Morozov, I; Büchner, B; Yaresko, A N; Boris, A V; Borisenko, S V; Basov, D N.
Afiliação
  • Charnukha A; Physics Department, University of California-San Diego, La Jolla, CA 92093, USA.
  • Post KW; Leibniz Institute for Solid State and Materials Research, IFW, 01069 Dresden, Germany.
  • Thirupathaiah S; Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany.
  • Pröpper D; Physics Department, University of California-San Diego, La Jolla, CA 92093, USA.
  • Wurmehl S; Leibniz Institute for Solid State and Materials Research, IFW, 01069 Dresden, Germany.
  • Roslova M; Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore-560 012, India.
  • Morozov I; Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany.
  • Büchner B; Leibniz Institute for Solid State and Materials Research, IFW, 01069 Dresden, Germany.
  • Yaresko AN; Leibniz Institute for Solid State and Materials Research, IFW, 01069 Dresden, Germany.
  • Boris AV; Department of Chemistry, Moscow State University, 119991 Moscow, Russia.
  • Borisenko SV; Leibniz Institute for Solid State and Materials Research, IFW, 01069 Dresden, Germany.
  • Basov DN; Department of Chemistry, Moscow State University, 119991 Moscow, Russia.
Sci Rep ; 6: 18620, 2016 Jan 05.
Article em En | MEDLINE | ID: mdl-26729630
Iron-based superconductors have been found to exhibit an intimate interplay of orbital, spin, and lattice degrees of freedom, dramatically affecting their low-energy electronic properties, including superconductivity. Albeit the precise pairing mechanism remains unidentified, several candidate interactions have been suggested to mediate the superconducting pairing, both in the orbital and in the spin channel. Here, we employ optical spectroscopy (OS), angle-resolved photoemission spectroscopy (ARPES), ab initio band-structure, and Eliashberg calculations to show that nearly optimally doped NaFe0.978Co0.022As exhibits some of the strongest orbitally selective electronic correlations in the family of iron pnictides. Unexpectedly, we find that the mass enhancement of itinerant charge carriers in the strongly correlated band is dramatically reduced near the Γ point and attribute this effect to orbital mixing induced by pronounced spin-orbit coupling. Embracing the true band structure allows us to describe all low-energy electronic properties obtained in our experiments with remarkable consistency and demonstrate that superconductivity in this material is rather weak and mediated by spin fluctuations.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2016 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2016 Tipo de documento: Article