Topological Phase Transitions Driven by Magnetic Phase Transitions in Fe x Bi 2 Te 3 ( 0 ≤ x <mml:mo mathvariant="…
2013; American Physical Society; Volume: 110; Issue: 13 Linguagem: Inglês
10.1103/physrevlett.110.136601
ISSN1092-0145
AutoresHeon‐Jung Kim, Ki‐Seok Kim, J.-F. Wang, V.A. Kulbachinskii, K. Ogawa, Minoru Sasaki, Akira Ohnishi, Mamoru Kitaura, Yue Wu, Li Li, Isamu Yamamoto, Junpei Azuma, Masao Kamada, V. Dobrosavljević,
Tópico(s)Magnetic and transport properties of perovskites and related materials
ResumoWe 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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