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19 April 2024

» arxiv » 1710.6238

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Spectroscopic perspective on the interplay between electronic and magnetic properties of magnetically doped topological insulators
Jonas A. Krieger ; Cui-Zu Chang ; Marius-Adrian Husanu ; Daria Sostina ; Arthur Ernst ; Mikhail M. Otrokov ; Thomas Prokscha ; Thorsten Schmitt ; Andreas Suter ; Maia Garcia Vergniory ; Evgueni V. Chulkov ; Jagadeesh S. Moodera ; Vladimir N. Strocov ; Zaher Salman ;
Date:	17 Oct 2017
Abstract:	We combine low energy muon spin rotation (LE-$mu$SR) and soft-X-ray angle-resolved photoemission spectroscopy (SX-ARPES) to study the magnetic and electronic properties of magnetically doped topological insulators based on (Bi,Sb)$_2$Te$_3$. 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 $gtrsim$ 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 $L_3$-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 on the observation of the quantum anomalous Hall effect at mK temperatures are discussed.
Source:	arXiv, 1710.6238
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