journal article·2023-04Open access

Intermixing‐Driven Surface and Bulk Ferromagnetism in the Quantum Anomalous Hall Candidate MnBi6Te10

Abdul‐Vakhab Tcakaev, Bastian Rubrecht, Jorge I. Facio, Volodymyr B. Zabolotnyy, Laura T. Corredor, Laura C. Folkers, Ekaterina Kochetkova, Thiago R. F. Peixoto, Philipp Kagerer, Simon Heinze, Hendrik Bentmann, Robert J. Green, Pierluigi Gargiani, Manuel Valvidares, Eugen Weschke, Maurits W. Haverkort, Friedrich Reinert, Jeroen van den Brink, Bernd Büchner, Anja U. B. Wolter, Anna Isaeva, Vladimir Hinkov

Advanced Science· Volume 10· Issue 10

Abstract

Abstract The recent realizations of the quantum anomalous Hall effect (QAHE) in MnBi2Te4 and MnBi4Te7 benchmark the (MnBi2Te4)(Bi2Te3)n family as a promising hotbed for further QAHE improvements. The family owes its potential to its ferromagnetically (FM) ordered MnBi2Te4 septuple layers (SLs). However, the QAHE realization is complicated in MnBi2Te4 and MnBi4Te7 due to the substantial antiferromagnetic (AFM) coupling between the SLs. An FM state, advantageous for the QAHE, can be stabilized by interlacing the SLs with an increasing number n of Bi2Te3 quintuple layers (QLs). However, the mechanisms driving the FM state and the number of necessary QLs are not understood, and the surface magnetism remains obscure. Here, robust FM properties in MnBi6Te10 (n = 2) with Tc ≈ 12 K are demonstrated and their origin is established in the Mn/Bi intermixing phenomenon by a combined experimental and theoretical study. The measurements reveal a magnetically intact surface with a large magnetic moment, and with FM properties similar to the bulk. This investigation thus consolidates the MnBi6Te10 system as perspective for the QAHE at elevated temperatures.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Advanced Condensed Matter Physics · Magnetic and transport properties of perovskites and related materials

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

Affiliations

Physikalisches Institut (EP‐IV) Universität Würzburg Am Hubland D‐97074 Würzburg Germany

Würzburg‐Dresden Cluster of Excellence ct.qmat Germany

Leibniz Institut für Festkörper‐ und Werkstoffforschung (IFW) Dresden Helmholtzstraße 20 D‐01069 Dresden Germany

Centro Atómico Bariloche Instituto de Nanociencia y Nanotecnología (CNEA‐CONICET) and Instituto Balseiro. Av. Bustillo 9500 Bariloche 8400 Argentina

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

Physikalisches Institut (EP‐VII) Universität Würzburg Am Hubland D‐97074 Würzburg Germany

Institute for Theoretical Physics Heidelberg University Philosophenweg 19 69120 Heidelberg Germany

Department of Physics and Astronomy and Stewart Blusson Quantum Matter Institute University of British Columbia Vancouver British Columbia V6T 1Z4 Canada

Department of Physics and Engineering Physics University of Saskatchewan Saskatoon SK S7N 5E2 Canada

ALBA Synchrotron Light Source E‐08290 Cerdanyola del Vallès Barcelona Spain

Helmholtz‐Zentrum Berlin für Materialien und Energie Albert‐Einstein‐Straße 15 D‐12489 Berlin Germany

Institut für Theoretische Physik Technische Universität Dresden D‐01062 Dresden Germany

Van der Waals‐Zeeman Institute Department of Physics and Astronomy University of Amsterdam Science Park 904 Amsterdam 1098 XH The Netherlands

Funding

Abraham Lincoln Brigade Archives · Helmholtz-Zentrum Berlin für Materialien und Energie · Deutsche Forschungsgemeinschaft · Alexander von Humboldt-Stiftung · Natural Sciences and Engineering Research Council of Canada

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