Ultrafast electron microscopy in material science<xref rid="cpb_27_7_070703fn1" ref-type="fn">*</xref><fn id="cpb_27_7_070703fn1"> <label>*</label><p>Project supported by the National Basic Research Program of China (Grant No. 2015CB921300), the National Key Research and Development Program of China (Grant Nos. 2016YFA0300300, 2017YFA0504703, and 2017YFA0302900), the National Natural Science Foundation of China (Grant Nos. 11604372, 11474323, and 11774391), the “Strategic Priority Research Program (B)” of the Chinese Academy of Sciences (Grant No. XDB07020000), and the Scientific Instrument Developing Project of the Chinese Academy of Sciences (Grant No. ZDKYYQ20170002). Z. A. L acknowledges the financial support of the Hundred Talent Program B from CAS.</p> </fn>

Ultrafast electron microscopy in material science* *

Project supported by the National Basic Research Program of China (Grant No. 2015CB921300), the National Key Research and Development Program of China (Grant Nos. 2016YFA0300300, 2017YFA0504703, and 2017YFA0302900), the National Natural Science Foundation of China (Grant Nos. 11604372, 11474323, and 11774391), the “Strategic Priority Research Program (B)” of the Chinese Academy of Sciences (Grant No. XDB07020000), and the Scientific Instrument Developing Project of the Chinese Academy of Sciences (Grant No. ZDKYYQ20170002). Z. A. L acknowledges the financial support of the Hundred Talent Program B from CAS.

Yang Huaixin^{1, 2}, Sun Shuaishuai¹, Zhang Ming^{1, 2}, Li Zhongwen^{1, 2}, Li Zian¹, Xu Peng¹, Tian Huanfang¹, Li Jianqi^{1, 2, 3, †}

(color online) Picosecond view of the MT transition and nucleation in the shape-memory alloy Mn₅₀Ni₄₀Sn₁₀. (a) Series of ultrafast micrographs showing the periodic annihilation and creation of domains. (b) Structural oscillation obtained from (a), where we clearly observe that the relaxation time of the oscillation is > 500 ps. (c) Careful analysis of the domain nucleation for the boxed area in (a) between t₁ = 23 ps and t₂ = 46 ps; the presence of tweedlike patterns is evident. The inset of each frame illustrates the progress of the (080) spots, followed by MT domain nucleation. (d) Schematic showing the structural oscillation of Mn₅₀Ni₄₀Sn₁₀ due to the strong coupling between the MT transition and the breathing mode. Reprinted from Ref. [59] with permission.