Misfit strain accommodation in epitaxial ABO3 perovskites: Lattice rotations and lattice modulations
Misfit strain accommodation in epitaxial ABO3 perovskites: Lattice rotations and lattice modulations
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DOI：
10.1103/physrevb.83.064101
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发表时间：
2011-02-11
影响因子：
3.7
通讯作者：
Koster, G.
中科院分区：
文献类型：
--
作者：
Vailionis, A.;Boschker, H.;Koster, G.
我们研究了在多种单晶衬底上生长的La0.67Sr0.33MnO3 （LSMO）和SrRuO3 （SRO）薄膜对压缩和拉伸双轴应力的晶格响应：SrTiO3， DyScO3， NdGaO3和（La,Sr）（Al,Ta）O-3。结果表明，在失配应变作用下的薄膜中，SRO和LSMO晶格均具有正交（SRO）和菱形（LSMO）结构，在压缩应力下呈单斜晶胞，在拉伸应力下呈四方晶胞。施加的应力有效地改变了BO6八面体的旋转，其程度和方向可以通过失配应变的大小和符号来控制。这种晶格畸变改变了B-O-B键角，因此预计会影响ABO(3)钙钛矿的磁性和电子性质。
We present a study of the lattice response to the compressive and tensile biaxial stress in La0.67Sr0.33MnO3 (LSMO) and SrRuO3 (SRO) thin films grown on a variety of single-crystal substrates: SrTiO3, DyScO3, NdGaO3, and (La,Sr)(Al,Ta)O-3. The results show that, in thin films under misfit strain, both SRO and LSMO lattices, which in bulk form have orthorhombic (SRO) and rhombohedral (LSMO) structures, assume unit cells that are monoclinic under compressive stress and tetragonal under tensile stress. The applied stress effectively modifies the BO6 octahedra rotations, whose degree and direction can be controlled by the magnitude and sign of the misfit strain. Such lattice distortions change the B-O-B bond angles and therefore are expected to affect magnetic and electronic properties of the ABO(3) perovskites.