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Ultrafast transmission electron microscopy on dynamic process of a CDW transition in 1T-TaSe2

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arxiv 1505.05294 v1 pith:WTXEOJMT submitted 2015-05-20 cond-mat.str-el physics.ins-det

Shuaishuai Sun , Linlin Wei , Zhongwen Li , Gaolong Cao , Y.Liu , W.J.Lu , Y. P. Sun , Huanfang Tian
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HuaixinYang Jianqi Li
This is my paper · ORCID
classification cond-mat.str-elphysics.ins-det
keywords phasestructuraltransitiondynamicelectronmicroscopyobservedphases
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Four-dimensional ultrafast transmission electron microscopy (4D-UTEM) measurements reveal a rich variety of structural dynamic phenomena at a phase transition in the charge-density-wave (CDW) 1T-TaSe2. Through the photoexcitation, remarkable changes on both the CDW intensity and orientation are clearly observed associated with the transformation from a commensurate (C) into an incommensurate (IC) phase in a time-scale of about 3 ps. Moreover, the transient states show up a notable "structurally isosbestic point" at a wave vector of qiso where the C and IC phases yield their diffracting efficiencies in an equally ratio. This fact demonstrates that the crystal planes parallel to qiso adopts visibly common structural features in these two CDW phases. The second-order characters observed in this nonequilibrium phase transition have been also analyzed based on the time-resolved structural data.

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