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Phase Separation and Bulk p-n Transition in Single Crystals of Bi2Te2Se Topological Insulator



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Separation of ordered and disordered phases is found along the growth axis of a Bi2Te2Se crystal rod. A high bulk resistivity is found in phase II, which is an ideal candidate for investigation of the transport properties of the surface states. The bulk insulating feature of phase II is caused by the opposing effects of different types of defects.