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Topological phase transitions driven by magnetic phase transitions in FexBi2Te3 (0 < x < 0.1) single crystals

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arxiv 1302.4806 v1 pith:3MMH37ML submitted 2013-02-20 cond-mat.str-el

Topological phase transitions driven by magnetic phase transitions in FexBi2Te3 (0 < x < 0.1) single crystals

Heon-Jung Kim , Ki-Seok Kim , J.-F. Wang , V. A. Kulbachinskii , K. Ogawa , M. Sasaki , A. Ohnishi , M. Kitaura
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Y.-Y. Wu L. Li I. Yamamoto J. Azuma M. Kamada V. Dobrosavljevi\'c
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keywords phasetopologicalinsulatortransitionsbehaviourscrystalsdiagramfexbi2te3
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We propose a phase diagram for FexBi2Te3 (0 < x < 0.1) single crystals, which belong to a class of magnetically bulk-doped topological insulators. The evolution of magnetic correlations from ferromagnetic- to antiferromagnetic- gives rise to topological phase transitions, where the paramagnetic topological insulator of Bi2Te3 turns into a band insulator with ferromagnetic-cluster glassy behaviours around x ~ 0.025, and it further evolves to a topological insulator with valence-bond glassy behaviours, which spans over the region between x ~ 0.03 up to x ~ 0.1. This phase diagram is verified by measuring magnetization, magnetotransport, and angle-resolved photoemission spectra with theoretical discussions.

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