We propose a phase diagram for () 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 turns into a band insulator with ferromagnetic-cluster glassy behavior around , and it further evolves to a topological insulator with valence-bond glassy behavior, which spans over the region from up to . This phase diagram is verified by measuring magnetization, magnetotransport, and angle-resolved photoemission spectra with theoretical discussions.
- Received 6 August 2012
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