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  Observation of a remarkable reduction of correlation effects in BaCr2As2 by ARPES

Nayak, J., Filsinger, K., Fecher, G. H., Chadov, S., Minár, J., Rienks, E. D. L., et al. (2017). Observation of a remarkable reduction of correlation effects in BaCr2As2 by ARPES. Proceedings of the National Academy of Sciences of the United States of America, 114(47), 12425-12429. doi:10.1073/pnas.1702234114.

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Nayak, Jayita1, Autor           
Filsinger, Kai1, Autor           
Fecher, Gerhard H.2, Autor           
Chadov, Stanislav3, Autor           
Minár, Ján4, Autor
Rienks, Emile D. L.4, Autor
Büchner, Bernd4, Autor
Parkin, Stuart P.4, Autor
Fink, Jörg1, Autor           
Felser, Claudia5, Autor           
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2Gerhard Fecher, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863431              
3Stanislav Chadov, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863440              
4External Organizations, ou_persistent22              
5Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Zusammenfassung: The superconducting phase in iron-based high-Tc superconductors (FeSC), as in other unconventional superconductors such as the cuprates, neighbors a magnetically ordered one in the phase diagram. This proximity hints at the importance of electron correlation effects in these materials, and Hund’s exchange interaction has been suggested to be the dominant correlation effect in FeSCs because of their multiband nature. By this reasoning, correlation should be strongest for materials closest to a half-filled 3d electron shell (Mn compounds, hole-doped FeSCs) and decrease for systems with both higher (electron-doped FeSCs) and lower (Cr-pnictides) 3d counts. Here we address the strength of correlation effects in nonsuperconducting antiferromagnetic BaCr2As2 by means of angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations. This combination provides us with two handles on the strength of correlation: First, a comparison of the experimental and calculated effective masses yields the correlation-induced mass renormalization. In addition, the lifetime broadening of the experimentally observed dispersions provides another measure of the correlation strength. Both approaches reveal a reduction of electron correlation in BaCr2As2 with respect to systems with a 3d count closer to five. Our results thereby support the theoretical predictions that Hund’s exchange interaction is important in these materials.

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Sprache(n): eng - English
 Datum: 2017-11-212017-11-21
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1073/pnas.1702234114
 Art des Abschluß: -

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Titel: Proceedings of the National Academy of Sciences of the United States of America
  Andere : Proceedings of the National Academy of Sciences of the USA
  Andere : Proc. Acad. Sci. USA
  Andere : Proc. Acad. Sci. U.S.A.
  Kurztitel : PNAS
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Washington, D.C. : National Academy of Sciences
Seiten: - Band / Heft: 114 (47) Artikelnummer: - Start- / Endseite: 12425 - 12429 Identifikator: ISSN: 0027-8424
CoNE: https://pure.mpg.de/cone/journals/resource/954925427230