Ferroelastic twin structures in epitaxial WO3 thin films

Shinhee Yun, Chang Su Woo, Gi Yeop Kim, Pankaj Sharma, Jin Hong Lee, Kanghyun Chu, Jong Hyun Song, Sung Yoon Chung, Jan Seidel, Si Young Choi, Chan Ho Yang

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Tungsten trioxide is a binary oxide that has potential applications in electrochromic windows, gas sensors, photo-catalysts, and superconductivity. Here, we analyze the crystal structure of atomically flat epitaxial layers on YAlO3 single crystal substrates and perform nanoscale investigations of the ferroelastic twins revealing a hierarchical structure at multiple length scales. We have found that the finest stripe ferroelastic twin walls along pseudocubic <100>axes are associated with cooperative mosaic rotations of the monoclinic films and the larger stripe domains along pseudocubic <110> axes are created to reduce the misfit strain through a commensurate matching of an effective in-plane lattice parameter between film and substrate. The typical widths of the two fine and larger stripe domains increase with film thickness following a power law with scaling exponents of ∼0.6 and ∼0.4, respectively. We have also found that the twin structure can be readily influenced by illumination with an electron beam or a tip-based mechanical compression.

Original languageEnglish
Article number252904
Number of pages5
JournalApplied Physics Letters
Issue number25
Publication statusPublished - 21 Dec 2015
Externally publishedYes


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