[2Ba02-13] SPM Division's Session

[2Ba09] Aperiodic electronic superstructure in a misfit layered chalcogenide

*Yuhki Kohsaka¹, Masaharu Shirata², Teppei Ueno², Tadashi Machida¹, Tetsuo Hanaguri¹, Kaya Kobayashi^2,3 (1. RIKEN Center for Emergent Matter Science, 2. Department of Physics, Okayama University, 3. Research Institute for Interdisciplinary Science, Okayama University)

We report STM/STS experiments of(PbSe)1.16(TiSe2)2 and (SnSe)1.18(TiSe2)2. The crystal structure of these materials is layered stacking of octahedral 1T-TiSe2 layer and rocksalt PbSe/SnSe layer, which are different in symmetry and periodicity. We find that, depending on the termination layers, 2x2 CDW found in 1T-TiSe2 disappears and a new aperiodic electronic superstructure emerges. We ascribe these results to changes in the electronic states induced by charge transfer and bond strength between the layers.