Gebhardt U, Kasper N V, Vigliante A, Wochner P, Dosch H, Razavi F S, Habermeier H-U
Max-Planck-Institut für Metallforschung, Heisenbergstrasse 3, 70569 Stuttgart, Germany.
Phys Rev Lett. 2007 Mar 2;98(9):096101. doi: 10.1103/PhysRevLett.98.096101. Epub 2007 Feb 27.
We present an extended synchrotron x-ray scattering study of the structure of thin manganite films grown on SrTiO3(001) substrates and reveal a new kind of misfit strain relaxation process which exploits twinning to adjust lattice mismatch. We show that this relaxation mechanism emerges in thin films as one-dimensional twinning waves which freeze out into a twin domain pattern as the manganite film continues to grow. A quantitative microscopic model which uses a matrix formalism is able to reproduce all x-ray features and provides a detailed insight into this novel relaxation mechanism. We further demonstrate how this twin angle pattern affects the transport properties in these functional films.
我们展示了一项对生长在SrTiO3(001)衬底上的锰氧化物薄膜结构进行的扩展同步加速器X射线散射研究，并揭示了一种新型的失配应变弛豫过程，该过程利用孪晶来调整晶格失配。我们表明，这种弛豫机制在薄膜中以一维孪晶波的形式出现，随着锰氧化物薄膜的持续生长，这些孪晶波会冻结成孪晶畴图案。一个使用矩阵形式的定量微观模型能够重现所有X射线特征，并对这种新型弛豫机制提供详细的见解。我们进一步证明了这种孪晶角图案如何影响这些功能薄膜的输运性质。
