Zhan Q, Yu R, He L L, Li D X, Li J, Xu S Y, Ong C K
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China.
Phys Rev Lett. 2002 May 13;88(19):196104. doi: 10.1103/PhysRevLett.88.196104. Epub 2002 Apr 29.
A reversible structural transition of an epitaxial La(2/3)Sr(1/3)MnO3 film deposited on a LaAlO3 substrate has been investigated by means of in situ high-resolution transmission electron microscopy and electron diffraction, combined with image and diffraction calculations. We observe that the crystallographic symmetry of the film can be lowered via electron beam irradiation, leading to a rhombohedral-monoclinic transition. This transition can be attributed to the cooperating effect of the mismatch stress and the irradiation-induced thermal stress.
通过原位高分辨率透射电子显微镜和电子衍射，并结合图像和衍射计算，研究了沉积在LaAlO₃衬底上的外延La(₂/₃)Sr(₁/₃)MnO₃薄膜的可逆结构转变。我们观察到，通过电子束辐照可以降低薄膜的晶体学对称性，从而导致菱面体-单斜转变。这种转变可归因于失配应力和辐照诱导的热应力的协同作用。
