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000888146 1001_ $$0P:(DE-HGF)0$$aPeixoto, Thiago R. F.$$b0$$eCorresponding author
000888146 245__ $$aNon-local effect of impurity states on the exchange coupling mechanism in magnetic topological insulators
000888146 260__ $$a[London]$$bNature Publishing Group$$c2020
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000888146 520__ $$aSince the discovery of the quantum anomalous Hall (QAH) effect in the magnetically doped topological insulators (MTI) Cr:(Bi,Sb)2Te3 and V:(Bi,Sb)2Te3, the search for the magnetic coupling mechanisms underlying the onset of ferromagnetism has been a central issue, and a variety of different scenarios have been put forward. By combining resonant photoemission, X-ray magnetic circular dichroism and density functional theory, we determine the local electronic and magnetic configurations of V and Cr impurities in (Bi,Sb)2Te3. State-of-the-art first-principles calculations find pronounced differences in their 3d densities of states, and show how these impurity states mediate characteristic short-range pd exchange interactions, whose strength sensitively varies with the position of the 3d states relative to the Fermi level. Measurements on films with varying host stoichiometry support this trend. Our results explain, in an unified picture, the origins of the observed magnetic properties, and establish the essential role of impurity-state-mediated exchange interactions in the magnetism of MTI.
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000888146 7001_ $$0P:(DE-HGF)0$$aBentmann, Hendrik$$b1
000888146 7001_ $$0P:(DE-Juel1)157882$$aRüßmann, Philipp$$b2
000888146 7001_ $$00000-0001-7620-3320$$aTcakaev, Abdul-Vakhab$$b3
000888146 7001_ $$0P:(DE-HGF)0$$aWinnerlein, Martin$$b4
000888146 7001_ $$0P:(DE-HGF)0$$aSchreyeck, Steffen$$b5
000888146 7001_ $$0P:(DE-HGF)0$$aSchatz, Sonja$$b6
000888146 7001_ $$0P:(DE-HGF)0$$aVidal, Raphael Crespo$$b7
000888146 7001_ $$00000-0002-1709-1848$$aStier, Fabian$$b8
000888146 7001_ $$0P:(DE-HGF)0$$aZabolotnyy, Volodymyr$$b9
000888146 7001_ $$0P:(DE-HGF)0$$aGreen, Robert J.$$b10
000888146 7001_ $$0P:(DE-HGF)0$$aMin, Chul Hee$$b11
000888146 7001_ $$0P:(DE-HGF)0$$aFornari, Celso I.$$b12
000888146 7001_ $$0P:(DE-HGF)0$$aMaaß, Henriette$$b13
000888146 7001_ $$0P:(DE-HGF)0$$aVasili, Hari Babu$$b14
000888146 7001_ $$0P:(DE-HGF)0$$aGargiani, Pierluigi$$b15
000888146 7001_ $$00000-0003-4895-8114$$aValvidares, Manuel$$b16
000888146 7001_ $$00000-0002-5632-4915$$aBarla, Alessandro$$b17
000888146 7001_ $$0P:(DE-HGF)0$$aBuck, Jens$$b18
000888146 7001_ $$00000-0002-0114-2110$$aHoesch, Moritz$$b19
000888146 7001_ $$0P:(DE-HGF)0$$aDiekmann, Florian$$b20
000888146 7001_ $$0P:(DE-HGF)0$$aRohlf, Sebastian$$b21
000888146 7001_ $$0P:(DE-HGF)0$$aKalläne, Matthias$$b22
000888146 7001_ $$00000-0001-5107-0090$$aRossnagel, Kai$$b23
000888146 7001_ $$0P:(DE-HGF)0$$aGould, Charles$$b24
000888146 7001_ $$0P:(DE-HGF)0$$aBrunner, Karl$$b25
000888146 7001_ $$0P:(DE-Juel1)130548$$aBlügel, Stefan$$b26$$ufzj
000888146 7001_ $$00000-0002-6602-1002$$aHinkov, Vladimir$$b27
000888146 7001_ $$0P:(DE-HGF)0$$aMolenkamp, Laurens W.$$b28
000888146 7001_ $$0P:(DE-HGF)0$$aReinert, Friedrich$$b29
000888146 773__ $$0PERI:(DE-600)2882263-8$$a10.1038/s41535-020-00288-0$$gVol. 5, no. 1, p. 87$$n1$$p87$$tnpj quantum materials$$v5$$x2397-4648$$y2020
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