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journal article·2024-09Open access

Ubiquitous Order‐Disorder Transition in the Mn Antisite Sublattice of the (MnBi2Te4)(Bi2Te3)n Magnetic Topological Insulators

Manaswini Sahoo, Ifeanyi John Onuorah, Laura Christina Folkers, Ekaterina Kochetkova, Evgueni V. Chulkov, Mikhail M. Otrokov, Ziya S. Aliev, Imamaddin R. Amiraslanov, Anja U. B. Wolter, Bernd Büchner, Laura Teresa Corredor, Chennan Wang, Zaher Salman, Anna Isaeva, Roberto De Renzi, Giuseppe Allodi

Advanced Science· Volume 11· Issue 34
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Source abstract

Abstract

Abstract Magnetic topological insulators (TIs) herald a wealth of applications in spin‐based technologies, relying on the novel quantum phenomena provided by their topological properties. Particularly promising is the (MnBi2Te4)(Bi2Te3)n layered family of established intrinsic magnetic TIs that can flexibly realize various magnetic orders and topological states. High tunability of this material platform is enabled by manganese–pnictogen intermixing, whose amounts and distribution patterns are controlled by synthetic conditions. Here, nuclear magnetic resonance and muon spin spectroscopy, sensitive local probe techniques, are employed to scrutinize the impact of the intermixing on the magnetic properties of (MnBi2Te4)(Bi2Te3)n and MnSb2Te4. The measurements not only confirm the opposite alignment between the Mn magnetic moments on native sites and antisites in the ground state of MnSb2Te4, but for the first time directly show the same alignment in (MnBi2Te4)(Bi2Te3)n with n = 0, 1 and 2. Moreover, for all compounds, the static magnetic moment of the Mn antisite sublattice is found to disappear well below the intrinsic magnetic transition temperature, leaving a homogeneous magnetic structure undisturbed by the intermixing. The findings provide a microscopic understanding of the crucial role played by Mn–Bi intermixing in (MnBi2Te4)(Bi2Te3)n and offer pathways to optimizing the magnetic gap in its surface states.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Advanced Condensed Matter Physics · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Leibniz IFW Dresden Helmholtzstraße 20 D‐01069 Dresden Germany

Institut für Festkörper‐ und Materialphysik Technische Universität Dresden 01062 Dresden Germany

Würzburg‐Dresden Cluster of Excellence ct.qmat Dresden Germany

Dipartimento di Scienze Matematiche Fisiche e Informatiche Universitá di Parma Parco delle Scienze 7A Parma I‐43124 Italy

Van der Waals‐Zeeman Institute Department of Physics and Astronomy University of Amsterdam Science Park 094 Amsterdam 1098 XH Netherlands

Donostia International Physics Center Sebastián 20018 Donostia‐San Spain

Departamento de Polímeros y Materiales Avanzados: Física, Química y Tecnología, Facultad de Ciencias Químicas Universidad del País Vasco UPV/EHU Donostia‐San Sebastián 20018 Spain

Centro de Física de Materiales (CFM‐MPC) Centro Mixto (CSIC‐UPV/EHU) Donostia‐San Sebastián 20018 Spain

Saint Petersburg State University Saint Petersburg 199034 Russia

Instituto de Nanociencia y Materiales de Aragón (INMA) CSIC‐Universidad de Zaragoza Zaragoza 50009 Spain

Baku State University Baku AZ1148 Azerbaijan

Institute of Physics Ministry of Science and Education Republic of Azerbaijan Baku AZ1143 Azerbaijan

Laboratory for Muon Spin Spectroscopy Paul‐Scherrer‐Institute Villigen PSI CH‐5232 Switzerland

Faculty of Physics Technical University of Dortmund Otto‐Hahn‐Str. 4 44221 Dortmund Germany

Research Center Future Energy Materials and Systems (RC FEMS) Germany

Funding

Ministero dell’Istruzione, dell’Università e della Ricerca · Deutsche Forschungsgemeinschaft · Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

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