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

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, (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 of our results on the observation of the quantum anomalous Hall effect at mK temperatures are discussed.

References in corpus (28)

• Topological insulators and superconductors
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
• Seeing the magnetic monopole through the mirror of topological surface states
• Topological quantization of the spin Hall effect in two-dimensional paramagnetic semiconductors
• Band structure engineering in (Bi1-xSbx)2Te3 ternary topological insulators
• Chiral Topological Superconductor From the Quantum Hall State
• musrfit: A free platform-independent framework for muSR data analysis
• The development of ferromagnetism in the doped topological insulator Bi2-xMnxTe3
• Carrier-independent ferromagnetism and giant anomalous Hall effect in magnetic topological insulator
• Visualization of superparamagnetic dynamics in magnetic topological insulators
• Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi${}_{1-x}$Mn${}_x{)}_2$Se${}_3$
• Controllable magnetic doping of the surface state of a topological insulator
• Low temperature ferromagnetic properties of the diluted magnetic semiconductor Sb2-xCrxTe3
• Coincidence of Superparamagnetism and perfect quantization in the Quantum Anomalous Hall state
• High pressure research using muons at the Paul Scherrer Institute
• Unveiling the impurity band inducing ferromagnetism in magnetic semiconductor (Ga,Mn)As
• Experimental Verification of Van Vleck Nature of Long-Range Ferromagnetic Order in Vanadium-Doped Three-Dimensional Topological Insulator Sb${}_2$Te${}_3$
• Dual nature of magnetic dopants and competing trends in topological insulators
• Exchange interaction and its tuning in magnetic binary chalcogenides
• Origin of the low critical observing temperature of the quantum anomalous Hall effect in V-doped (Bi, Sb)2Te3 film
• Numerical solution of the relativistic single-site scattering problem for the Coulomb and the Mathieu potential
• Protective capping of topological surface states of intrinsically insulating Bi${}_2$Te${}_3$
• Impurity states in the magnetic topological insulator V:(Bi,Sb)${}_2$Te${}_3$
• Colossal anisotropy in diluted magnetic topological insulators
• Transverse field muon-spin rotation measurement of the topological anomaly in a thin film of MnSi
• Spin-Polarized Quantum Well States on Bi${}_{2-x}$Fe${}_x$Se${}_3$

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• Progress and prospects in magnetic topological materials
• k-Space imaging of anisotropic 2D electron gas in GaN/GaAlN high-electron-mobility transistor heterostructures
• The Effect of Nickel Substitution on Magnetism in the Layered van der Waals Ferromagnet Fe${}_3$GeTe${}_2$
• Spin- and angle-resolved photoemission on topological materials
• Progress and prospects in the quantum anomalous Hall effect
• Do topology and ferromagnetism cooperate at the EuS/Bi${}_2$Se${}_3$ interface?
• Microscopic effects of Dy-doping in the topological insulator Bi2Te3
• Intertwined magnetic, structural, and electronic transitions in V${}_2$O${}_3$
• Intrinsic magnetic topological insulators of the MnBi${}_2$Te${}_4$ family
• Ubiquitous impact of localised impurity states on the exchange coupling mechanism in magnetic topological insulators
• Ionic and electronic properties of the topological insulator Bi${}_2$Te${}_2$Se investigated using $\beta$-detected nuclear magnetic relaxation and resonance of ${}^8$Li
• Ambi-chiral anomalous Hall effect in magnetically doped topological insulators
• Magnetization relaxation and search for the magnetic gap in bulk-insulating V-doped (Bi, Sb)${}_2$Te${}_3$
• Surface-Localized Magnetic Order in RuO2 Thin Films Revealed by Low-Energy Muon Probes
• Doping-controlled surface conduction in topological insulators with warping effects
• Thin film and surface preparation chamber for the low energy muons spectrometer