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Phys Rev Lett. 2007 Jul 27;99(4):046401. Epub 2007 Jul 23.

STM studies of TbTe3: evidence for a fully incommensurate charge density wave.

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Department of Applied Physics, Stanford University, Stanford, California 94305, USA.


We observe unidirectional charge density wave (CDW) ordering on the quasi-2D material TbTe3 with a scanning tunneling microscope at approximately 6 K. Our analysis indicates that the CDW is fully incommensurate, with wave vector qCDW approximately 0.71x2pi/c. By imaging at various tip-sample voltages, we highlight effects of the subsurface layer and its effect on the CDW. We also observe an additional (possibly surface) dimerization and approximately 0.68x2pi/a ordering perpendicular to the CDW.

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