Spin dynamics and magnetic interactions of Mn dopants in the topological insulator Bi${}_2$Te${}_3$

Abstract

The magnetic and electronic properties of the magnetically doped topological insulator Bi${}_{2-\mathrm{x}}$Mn${}_{\mathrm{x}}$Te${}_3$ were studied using electron spin resonance (ESR) and measurements of static magnetization and electrical transport. The investigated high quality single crystals of Bi${}_{2-\mathrm{x}}$Mn${}_{\mathrm{x}}$Te${}_3$ show a ferromagnetic phase transition for $x\ge 0.04$ at $T_C\approx 12$ K. The Hall measurements reveal a p-type finite charge-carrier density. Measurements of the temperature dependence of the ESR signal of Mn dopants for different orientations of the external magnetic field give evidence that the localized Mn moments interact with the mobile charge carriers leading to a Ruderman-Kittel-Kasuya-Yosida-type ferromagnetic coupling between the Mn spins of order 2-3 meV. Furthermore, ESR reveals a low-dimensional character of magnetic correlations that persist far above the ferromagnetic ordering temperature.

References in corpus (15)

• Topological Insulators
• Topological insulators and superconductors
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Topological Field Theory of Time-Reversal Invariant Insulators
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• Seeing the magnetic monopole through the mirror of topological surface states
• Three-Dimensional Topological Insulators
• Magnetic impurities on the surface of a topological insulator
• Giant Magneto-optical Kerr Effect and Universal Faraday Effect in Thin-film Topological Insulators
• The development of ferromagnetism in the doped topological insulator Bi2-xMnxTe3
• Magnetic Proximity Effect as a Pathway to Spintronic Applications of Topological Insulators
• Stability, Electronic and Magnetic properties of magnetically doped topological insulators Bi2Se3, Bi2Te3 and Sb2Te3
• Exchange interaction and its tuning in magnetic binary chalcogenides
• Observation of Distinct Bulk and Surface Chemical Environments in a Topological Insulator under Magnetic doping
• Doping of Bi2Te3 using electron irradiation

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• Systemic Consequences of Disorder in Magnetically Self-Organized Topological MnBi${}_2$Te${}_4/$(Bi${}_2$Te${}_3$)${}_n$ Superlattices
• Two dimensional ordering and collective magnetic excitations in the dilute ferromagnetic topological insulator (Bi${}_{0.95}$Mn${}_{0.05}$)${}_2$Te${}_3$
• Local electronic and magnetic properties of the doped topological insulators Bi${}_2$Se${}_3$:Ca and Bi${}_2$Te${}_3$:Mn investigated using ion-implanted ${}^8$Li $\beta$-NMR
• Electron Spin Resonance Spectroscopy on Magnetic Van der Waals Compounds
• Magnetic properties of Mn-doped Bi${}_2$Se${}_3$ topological insulators: ab initio calculations
• Local moment formation and magnetic coupling of Mn guest atoms in Bi${}_2$Se${}_3$: a low-temperature ferromagnetic resonance study
• Role of Spin, Phonon and Plasmon Dynamics on Ferromagnetism in Cr doped 3C-SiC
• Magnetic interactions of 4$f$ electrons in the topological insulator chalcogenide Bi${}_2$Se${}_3$