中国物理B ›› 2022, Vol. 31 ›› Issue (12): 126801-126801.doi: 10.1088/1674-1056/ac8725
Zhenzhen Wang(王珍珍)1,2, Weiheng Qi(戚炜恒)2,3, Jiachang Bi(毕佳畅)4, Xinyan Li(李欣岩)1, Yu Chen(陈雨)3, Fang Yang(杨芳)1, Yanwei Cao(曹彦伟)4, Lin Gu(谷林)5, Qinghua Zhang(张庆华)1, Huanhua Wang(王焕华)3, Jiandi Zhang(张坚地)1, Jiandong Guo(郭建东)1,2,6,†, and Xiaoran Liu(刘笑然)1,‡
Zhenzhen Wang(王珍珍)1,2, Weiheng Qi(戚炜恒)2,3, Jiachang Bi(毕佳畅)4, Xinyan Li(李欣岩)1, Yu Chen(陈雨)3, Fang Yang(杨芳)1, Yanwei Cao(曹彦伟)4, Lin Gu(谷林)5, Qinghua Zhang(张庆华)1, Huanhua Wang(王焕华)3, Jiandi Zhang(张坚地)1, Jiandong Guo(郭建东)1,2,6,†, and Xiaoran Liu(刘笑然)1,‡
摘要: We report comprehensive investigations into the structure of high-quality (111)-oriented SrRuO3 films on SrTiO3 substrates to elucidate the effect of (111) heteroepitaxial strain. We found that SrRuO3 film with a thickness of ~ 40 nm is compressively strained in plane on the substrate with full coherency. Nevertheless, the out-of-plane spacing is almost the same as in the bulk, which is at odds with the conventional paradigm. By probing a series of half-order Bragg reflections using synchrotron-based x-ray diffraction combined with analyses of the scanning transmission electron microscopy images, we discovered that the heteroepitaxial strain is accommodated via significant suppression of the degree of c+ octahedral tilting and the formation of three equivalent domain structures on the (111) SrTiO3 substrate. This anomalous effect sheds light on the understanding of an unconventional paradigm of film-substrate coupling for the (111) heteroepitaxial strain.
中图分类号: (Thin film structure and morphology)