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Spin dynamics and magnetic interactions of Mn dopants in the topological insulator Bi2Te3

Author(s): Zimmermann, S.; Steckel, Frank; Hess, Christian; Ji, Huiwen; Hor, Yew San; et al

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Abstract: The magnetic and electronic properties of the magnetically doped topological insulator Bi2-xMnxTe3 were studied using electron-spin resonance (ESR) and measurements of static magnetization and electrical transport. The investigated high-quality single crystals of Bi2-xMnxTe3 show a ferromagnetic phase transition for x≥0.04 at TC≈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 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. © 2016 American Physical Society.
Publication Date: Sep-2016
Electronic Publication Date: 21-Sep-2016
Citation: Zimmermann, S., Steckel, F., Hess, C., Ji, H.W., Hor, Y.S., Cava, R.J., Büchner, B., Kataev, V. (2016). Spin dynamics and magnetic interactions of Mn dopants in the topological insulator. Physical Review B, 94 (12), 10.1103/PhysRevB.94.125205
DOI: doi:10.1103/PhysRevB.94.125205
ISSN: 2469-9950
EISSN: 2469-9969
Pages: 94.12:125205-1 - 125205-8
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Final published version. This is an open access article.
Notes: Physical Review B. Volume 94, Issue 12, 21 September 2016, Article number 125205.

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