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

被引：30

作者：

Zimmermann, S. ^{[1
,2
]}

Steckel, F. ^{[1
,3
]}

Hess, C. ^{[1
,3
]}

Ji, H. W. ^{[4
]}

Hor, Y. S. ^{[4
]}

Cava, R. J. ^{[4
]}

Buechner, B. ^{[1
,3
]}

Kataev, V. ^{[1
]}

机构：

[1] IFW Dresden, Leibniz Inst Solid State & Mat Res, D-01171 Dresden, Germany

[2] Tech Univ Dresden, Inst Solid State Phys, D-01069 Dresden, Germany

[3] Tech Univ Dresden, Ctr Transport & Devices, D-01069 Dresden, Germany

[4] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 12期

关键词：

SINGLE-CRYSTALS; VALENCE-BAND; RESONANCE; GD3+; EPR;

D O I：

10.1103/PhysRevB.94.125205

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 T-C approximate to 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.

引用

页数：8

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