The development of ferromagnetism in the doped topological insulator Bi2-xMnxTe3

Abstract

The development of ferromagnetism in Mn-doped Bi2Te3 is characterized through measurements on a series of single crystals with different Mn content. Scanning tunneling microscopy analysis shows that the Mn substitutes on the Bi sites, forming compounds of the type Bi2-xMnxTe3, and that the Mn substitutions are randomly distributed, not clustered. Mn doping first gives rise to local magnetic moments with Curie-like behavior, but by the compositions Bi1.96Mn0.04Te3 and Bi1.91Mn0.09Te3 a second order ferromagnetic transition is observed, with Tc ~ 9-12 K. The easy axis of magnetization in the ferromagnetic phase is perpendicular to the Bi2Te3 basal plane. Thermoelectric power and Hall effect measurements show that the Mn-doped Bi2Te3 crystals are p-type. Angle resolved photoemission spectroscopy measurements show that the topological surface states that are present in pristine Bi2Te3 are also present in ferromagnetic Mn-doped Bi2-xMnxTe3, and that the dispersion relations of the surface states are changed in a subtle fashion.

References in corpus (6)

• Topological Insulators with Inversion Symmetry
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• Phase transition between the quantum spin Hall and insulator phases in 3D: emergence of a topological gapless phase
• Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator
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• A hidden constant in the anomalous Hall effect of a high-purity magnet MnSi

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