Incipient antiferromagnetism in the Eu-doped topological insulator<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Te</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
A. Tcakaev, V. B. Zabolotnyy, Celso I. Fornari, Philipp Rüßmann, T. R. F. Peixoto, F. Stier, Michael Dettbarn, Philipp Kagerer, E. Weschke, E. Schierle, Peter Bencok, P. H. O. Rappl, E. Abramof, Hendrik Bentmann, E. Goering, F. Reinert, V. Hinkov
Abstract
Magnetic topological insulators combine two cornerstones of modern solid-state physics: band topology and electron correlations. To understand this class of materials, methods that address both itinerant and correlated electron properties are necessary. Here, the authors describe a systematic study of Eu-doped Bi${}_{2}$Te${}_{3}$ based on SQUID magnetometry, photoemission, resonant x-ray spectroscopy, and density functional theory. The synergy between these tools provides a comprehensive picture of a system, in which antiferromagnetism and topological surface states coexist, and which holds substantial promise for the realization of exotic states of matter such as the quantum anomalous Hall effect.