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Spectroscopic perspective on the interplay between electronic and magnetic properties of magnetically doped topological insulators

AuthorsKrieger, J. A.; Chang, Cui-Zu; Husanu, M.-A.; Sostina, Daria; Ernst, A.; Otrokov, M. M.; Prokscha, T.; Schmitt, Thorsten; Suter, A.; Vergniory, M.; Chulkov, Eugene V. CSIC ORCID; Moodera, J. S.; Strocov, Vladimir N.; Salman, Z.
Issue Date2017
PublisherAmerican Physical Society
CitationPhysical Review B 96(18): 184402 (2017)
AbstractWe combine low energy muon spin rotation (LE-μSR) and soft-x-ray angle-resolved photoemission spectroscopy (SX-ARPES) to study the magnetic and electronic properties of magnetically doped topological insulators, (Bi,Sb)2Te3. We find that one achieves a full magnetic volume fraction in samples of (V/Cr)x(Bi,Sb)2-xTe3 at doping levels x=0.16. The observed magnetic transition is not sharp in temperature indicating a gradual magnetic ordering. We find that the evolution of magnetic ordering is consistent with formation of ferromagnetic islands which increase in number and/or volume with decreasing temperature. Resonant ARPES at the V L3 edge reveals a nondispersing impurity band close to the Fermi level as well as V weight integrated into the host band structure. Calculations within the coherent potential approximation of the V contribution to the spectral function confirm that this impurity band is caused by V in substitutional sites. The implications of our results on the observation of the quantum anomalous Hall effect at mK temperatures are discussed.
Publisher version (URL)https://doi.org/10.1103/PhysRevB.96.184402
Identifiersdoi: 10.1103/PhysRevB.96.184402
e-issn: 2469-9969
issn: 2469-9950
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