Abstract
The successive Jahn-Teller phase transitions in Cs 2 PbCu(NO 2 ) 6 are studied with the X-ray scattering technique. Three ordered phases are observed to appear sequentially. The individual (001) atomic plane has the same antiferro-distorted structure throughout these ordered phases, and the structure of these phases is specified by giving the relative phase between the neighbouring (001) atomic layers. The conditional probabilities of finding a specified layer are determined by least-square fitting to the experimental diffraction characteristics. The close relationship between the stacking order of CDW in 1T-Ta 1- x Zn x Se 2 and the present system is discussed.
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