Artigo Acesso aberto Revisado por pares

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

ISSN

1092-0145

Autores

Heon‐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

Resumo

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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