Observation of local atomic displacements intrinsic to the double zigzag chain structure of 1T−MTe2 ( M=V, 

Unusual photoinduced crystal structure dynamics in TaTe2 with double zigzag chain superstructure

“…20) In addition, a recent X-ray diffraction study has reported the anomalously large anisotropic displacement of Ta at the double zigzag chain center already at the RT. 21) These indicate a characteristic structural instability inherent in 1 T″-TaTe 2 , and unique photoinduced crystal structure dynamics can be expected. Although photoinduced dynamics in the LT phase has been reported recently, 22,23) the RT 1 T″-TaTe 2 has not been investigated so far.…”

“…4) In addition, as mentioned above, some structural instability inherent to TaTe 2 was also reported at RT very recently. 21) In general, effect of electron multiple scattering and unintended local strain in the sample prevents the quantitative analysis of crystal structure from electron diffraction experiments. Therefore, development of novel quantitative crystal structure analysis technique in an ultrafast nonequilibrium regime overcoming the above problems is crucial for further understanding of the unusual crystal structure dynamics in TaTe 2 .…”