## Abstract

A number of different commensurate deformation modulated superstructures related to charge density waves is known to occur in octahedrally coordinated transition metal dichalcogenides, in particular the a \documentclass{article}\pagestyle{empty}\begin{document}$ \sqrt {13} $\end{document} type (in TaS_{2} and TaSe_{2}) and the a \documentclass{article}\pagestyle{empty}\begin{document}$ \sqrt {19} $\end{document} type (in NbTe_{2} and TaTe_{2}). Now a new superstructure of the same family in VSe_{2}, with a cell edge of a \documentclass{article}\pagestyle{empty}\begin{document}$ \sqrt {7} $\end{document}, is discovered. In the same material a further superstructure with unit cell edges 3a and an incommensurate modulated structure are observed. A pattern of weak spots due to a structure with a unit cell edge 2a \documentclass{article}\pagestyle{empty}\begin{document}$ \sqrt {7} $\end{document} is attributed to amplitude modulation of the CDW associated with the a \documentclass{article}\pagestyle{empty}\begin{document}$ \sqrt {7} $\end{document} structure. A unified geometrical model explaining the formation of these various superstructures in the transition metal dichalcogenides is proposed.

Original language | English |
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Pages (from-to) | 479-492 |

Number of pages | 14 |

Journal | physica status solidi (a) |

Volume | 46 |

Issue number | 2 |

DOIs | |

State | Published - 16 Apr 1978 |

## ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics