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We have synthesized Pb_{5}Bi_{24}Se_{41}, which is a new member of the(PbSe)_{5}(Bi2Se3)_{3m} homologous series with m = 4. This series of compoundsconsist of alternating layers of the topological insulator Bi2Se3 and theordinary insulator PbSe. Such a naturally-formed heterostructure has recentlybeen elucidated to give rise to peculiar quasi-two-dimensional topologicalstates throughout the bulk, and the discovery of Pb_{5}Bi_{24}Se_{41} expandsthe tunability of the topological states in this interesting homologous series.The trend in the resistivity anisotropy in this homologous series suggests animportant role of hybridization of the topological states in the out-of-planetransport.

Pb_{5}Bi_{24}Se_{41}: A New Member of the Homologous Series Forming Topological Insulator Heterostructures