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000888890 245__ $$aIncipient antiferromagnetism in the Eu-doped topological insulator Bi 2 Te 3
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000888890 520__ $$aRare-earth ions typically exhibit larger magnetic moments than transition-metal ions and thus promise the opening of a wider exchange gap in the Dirac surface states of topological insulators. Yet in a recent photoemission study of Eu-doped Bi2Te3 films, the spectra remained gapless down to T=20 K. Here we scrutinize whether the conditions for a substantial gap formation in this system are present by combining spectroscopic and bulk characterization methods with theoretical calculations. For all studied Eu doping concentrations, our atomic multiplet analysis of the M4,5 x-ray absorption and magnetic circular dichroism spectra reveals a Eu2+ valence and confirms a large magnetic moment, consistent with a 4f78S7/2 ground state. At temperatures below 10 K, bulk magnetometry indicates the onset of antiferromagnetic (AFM) ordering. This is in good agreement with density functional theory, which predicts AFM interactions between the Eu impurities. Our results support the notion that antiferromagnetism can coexist with topological surface states in rare-earth-doped Bi2Te3 and call for spectroscopic studies in the Kelvin range to look for novel quantum phenomena such as the quantum anomalous Hall effect.
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000888890 7001_ $$0P:(DE-HGF)0$$aZabolotnyy, V. B.$$b1$$eCorresponding author
000888890 7001_ $$0P:(DE-HGF)0$$aFornari, C. I.$$b2
000888890 7001_ $$0P:(DE-Juel1)157882$$aRüßmann, P.$$b3
000888890 7001_ $$0P:(DE-HGF)0$$aPeixoto, T. R. F.$$b4
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000888890 7001_ $$00000-0001-9096-7220$$aDettbarn, M.$$b6
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000888890 7001_ $$0P:(DE-HGF)0$$aWeschke, E.$$b8
000888890 7001_ $$0P:(DE-HGF)0$$aSchierle, E.$$b9
000888890 7001_ $$0P:(DE-HGF)0$$aBencok, P.$$b10
000888890 7001_ $$00000-0003-4548-3416$$aRappl, P. H. O.$$b11
000888890 7001_ $$0P:(DE-HGF)0$$aAbramof, E.$$b12
000888890 7001_ $$0P:(DE-HGF)0$$aBentmann, H.$$b13
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000888890 7001_ $$0P:(DE-HGF)0$$aReinert, F.$$b15
000888890 7001_ $$0P:(DE-HGF)0$$aHinkov, V.$$b16$$eCorresponding author
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