Abstract
The synthesis and physical properties of the new misfit compound (BiSe)1.15(TiSe2)2 are reported. Transmission electron microscopy and powder X-ray diffraction show that the structure consists of alternating rock-salt type BiSe layers and hexagonal (TiSe2)2 double layers. Resistivity, specific heat, and magnetization measurements show that it has metallic and diamagnetic behaviors. These results are interpreted and discussed in the context of the transition between single-layer (BiSe)1.13(TiSe2), which shows no charge density wave, and infinite-layered (bulk) 1T-TiSe2, which undergoes a charge density wave transition at T=202K. Intercalation with copper, Cux(BiSe)1.15(TiSe2)2, (0≤x≤0.10) is also reported, but unlike CuxTiSe2, no superconductivity is observed down to T=0.05K. Thus, the series Cux(BiSe)1+δ(TiSe2)n provides an effective approach to elucidate the impact of dimensionality on charge density wave formation and superconductivity.
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