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 (4)

• Topological Field Theory of Time-Reversal Invariant Insulators
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• The development of ferromagnetism in the doped topological insulator Bi2-xMnxTe3
• Observation of Distinct Bulk and Surface Chemical Environments in a Topological Insulator under Magnetic doping

Cited by in corpus (6)

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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${}_3$
• Electron Spin Resonance Spectroscopy on Magnetic Van der Waals Compounds
• Magnetic properties of Mn-doped Bi${}_2$Se${}_3$ topological insulators: ab initio calculations
• Magnetic interactions of 4$f$ electrons in the topological insulator chalcogenide Bi${}_2$Se${}_3$