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

S. Zimmermann; F. Steckel; C. Hess; H. W. Ji; Y. S. Hor; R. J. Cava; B. Büchner; V. Kataev

doi:10.1103/PhysRevB.94.125205

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

S. Zimmermann, F. Steckel, C. Hess, H. W. Ji, Y. S. Hor, R. J. Cava, B. Büchner, V. Kataev

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27 Scopus citations

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.

Original language	English (US)
Article number	125205
Journal	Physical Review B
Volume	94
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevB.94.125205
State	Published - Sep 21 2016

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.94.125205

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title = "Spin dynamics and magnetic interactions of Mn dopants in the topological insulator Bi2Te3",

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.",

author = "S. Zimmermann and F. Steckel and C. Hess and Ji, {H. W.} and Hor, {Y. S.} and Cava, {R. J.} and B. B{\"u}chner and V. Kataev",

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AU - Zimmermann, S.

AU - Steckel, F.

AU - Hess, C.

AU - Ji, H. W.

AU - Hor, Y. S.

AU - Cava, R. J.

AU - Büchner, B.

AU - Kataev, V.

PY - 2016/9/21

Y1 - 2016/9/21

N2 - 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.

AB - 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.

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

Abstract

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