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  Chemical Aspects of the Candidate Antiferromagnetic Topological Insulator MnBi2Te4

Zeugner, A., Nietschke, F., Wolter, A. U. B., Gaß, S., Vidal, R. C., Peixoto, T. R. F., et al. (2019). Chemical Aspects of the Candidate Antiferromagnetic Topological Insulator MnBi2Te4. Chemistry of Materials, 31(8), 2795-2806. doi:10.1021/acs.chemmater.8b05017.

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 Urheber:
Zeugner, Alexander1, Autor
Nietschke, Frederik1, Autor
Wolter, Anja U. B.1, Autor
Gaß, Sebastian1, Autor
Vidal, Raphael C.1, Autor
Peixoto, Thiago R. F.1, Autor
Pohl, Darius1, Autor
Damm, Christine1, Autor
Lubk, Axel1, Autor
Hentrich, Richard1, Autor
Moser, Simon K.1, Autor
Fornari, Celso1, Autor
Min, Chul Hee1, Autor
Schatz, Sonja1, Autor
Kißner, Katharina1, Autor
Ünzelmann, Maximilian1, Autor
Kaiser, Martin1, Autor
Scaravaggi, Francesco1, Autor
Rellinghaus, Bernd1, Autor
Nielsch, Kornelius1, Autor
Hess, Christian1, AutorBüchner, Bernd1, AutorReinert, Friedrich1, AutorBentmann, Hendrik1, AutorOeckler, Oliver1, AutorDoert, Thomas1, AutorRuck, Michael2, Autor           Isaeva, Anna1, Autor mehr..
Affiliations:
1External Organizations, ou_persistent22              
2Michael Ruck, Max Planck Fellow, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863444              

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 Zusammenfassung: High-quality single crystals of MnBi 2 Te 4 are grown for the first time by slow cooling within a narrow range between the melting points of Bi 2 Te 3 (586 °C) and MnBi 2 Te 4 (600 °C). Single-crystal X-ray diffraction and electron microscopy reveal ubiquitous antisite defects in both cation sites and, possibly, Mn vacancies (Mn 0.85(3) Bi 2.10(3) Te 4 ). Thermochemical studies complemented with high-temperature X-ray diffraction establish a limited high-temperature range of phase stability and metastability at room temperature. Nevertheless, the synthesis of MnBi 2 Te 4 can be scaled-up as powders can be obtained at subsolidus temperatures and quenched at room temperature. Bulk samples exhibit long-range antiferromagnetic ordering below 24 K. The Mn(II) out-of-plane magnetic state is confirmed by the magnetization, X-ray photoemission, X-ray absorption, and linear dichroism measurements. The compound shows a metallic type of resistivity in the range 4.5-300 K and is an n-type conductor that reaches a thermoelectric figure of merit up to ZT = 0.17. Angle-resolved photoemission experiments show a surface state forming a gapped Dirac cone, thus strengthening MnBi 2 Te 4 as a promising candidate for the intrinsic magnetic topological insulator, in accordance with theoretical predictions. The developed synthetic protocols enable further experimental studies of a crossover between magnetic ordering and nontrivial topology in bulk MnBi 2 Te 4 . © 2019 American Chemical Society.

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Sprache(n): eng - English
 Datum: 2019-04-022019-04-02
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
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 Identifikatoren: DOI: 10.1021/acs.chemmater.8b05017
BibTex Citekey: Zeugner20192795
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Titel: Chemistry of Materials
  Kurztitel : Chem. Mater.
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: Washington, D.C. : American Chemical Society
Seiten: - Band / Heft: 31 (8) Artikelnummer: - Start- / Endseite: 2795 - 2806 Identifikator: ISSN: 0897-4756
CoNE: https://pure.mpg.de/cone/journals/resource/954925561571