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

摘要

We 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)_2Te_3.We find that one achieves a full magnetic volume fraction in samples of (V/Cr)_x(Bi,Sb)_(2−x)Te_3 at doping levels x approx> 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.