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Charge density waves (CDW) in a tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ) single crystal have been studied with molecular resolution using a low temperature scanning tunneling microscope (STM). For the first time the periodicities of the CDW along both the a and b axes have been observed and were found to be coincident with those of the 2kF CDW. The influence of crystal singularities on the ordering of the CDW along the a axis was also revealed.
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Nishiguchi et al. (1998) studied this question.
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