%0 Journal Article %1 2019 %A Zeugner, Alexander %A Nietschke, Frederik %A Wolter, Anja U. B. %A Gaß, Sebastian %A Vidal, Raphael C. %A Peixoto, Thiago R. F. %A Pohl, Darius %A Damm, Christine %A Lubk, Axel %A Hentrich, Richard %A Moser, Simon K. %A Fornari, Celso %A Min, Chul Hee %A Schatz, Sonja %A Kißner, Katharina %A Ünzelmann, Maximilian %A Kaiser, Martin %A Scaravaggi, Francesco %A Rellinghaus, Bernd %A Nielsch, Kornelius %A Hess, Christian %A Büchner, Bernd %A Reinert, Friedrich %A Bentmann, Hendrik %A Oeckler, Oliver %A Doert, Thomas %A Ruck, Michael %A Isaeva, Anna %D 2019 %I American Chemical Society (ACS) %J Chem. Mater. %K d %N 8 %P 2795-2806 %R 10.1021/acs.chemmater.8b05017 %T Chemical aspects of the candidate antiferromagnetic topological insulator MnBi$_2$Te$_4$ %U https://doi.org/10.1021%2Facs.chemmater.8b05017 %V 31 %X 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 MnBi2Te4 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$_4$.

@article{2019, abstract = {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 MnBi2Te4 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$_4$.}, added-at = {2021-11-05T13:04:15.000+0100}, author = {Zeugner, Alexander and Nietschke, Frederik and Wolter, Anja U. B. and Gaß, Sebastian and Vidal, Raphael C. and Peixoto, Thiago R. F. and Pohl, Darius and Damm, Christine and Lubk, Axel and Hentrich, Richard and Moser, Simon K. and Fornari, Celso and Min, Chul Hee and Schatz, Sonja and Kißner, Katharina and Ünzelmann, Maximilian and Kaiser, Martin and Scaravaggi, Francesco and Rellinghaus, Bernd and Nielsch, Kornelius and Hess, Christian and Büchner, Bernd and Reinert, Friedrich and Bentmann, Hendrik and Oeckler, Oliver and Doert, Thomas and Ruck, Michael and Isaeva, Anna}, biburl = {https://www.bibsonomy.org/bibtex/2d544a8ed80da8f146feb7da4834ec05f/ctqmat}, day = 02, description = {Chemical Aspects of the Candidate Antiferromagnetic Topological Insulator MnBi2Te4 | Chemistry of Materials}, doi = {10.1021/acs.chemmater.8b05017}, interhash = {5e487c3a55ce73bd7c98e86afbb60658}, intrahash = {d544a8ed80da8f146feb7da4834ec05f}, journal = {Chem. Mater.}, keywords = {d}, month = apr, number = 8, pages = {2795-2806}, publisher = {American Chemical Society ({ACS})}, timestamp = {2023-03-22T12:03:25.000+0100}, title = {Chemical aspects of the candidate antiferromagnetic topological insulator MnBi$_2$Te$_4$}, url = {https://doi.org/10.1021%2Facs.chemmater.8b05017}, volume = 31, year = 2019 }