期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 23, 页码 14871-14878出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b02864
关键词
SrRuO3; epitaxial strain; octahedral rotation; interfacial engineering; crystal symmetry
资金
- Air Force Office of Scientific Research [FA9550-12-1-0471]
- Advanced Photon Source [12-ID-D]
- Shanghai Synchrotron Radiation Facility [14B]
- National Natural Science Foundation of China [11374010, 11434009]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- Penn State MRSEC Center for Nanoscale Science [DMR-1420620]
- U.S. Department of Energy Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
- Laboratory Directed Research and Development Program of Lawrence Berkeley National Laboratory under U.S. Department of Energy [DE-AC02-05CH11231]
- U.S. Department of Energy, Office of Basic Energy Science [DE-SC0012375]
Epitaxial Strain can be used to tune the properties of complex oxides with perovskite structure. Beyond just lattice mismatch, the use of octahedral rotation mismatch at heterointerfaces could also provide an effective route to manipulate material properties. Here, we examine the evolution of the structural motif (i.e., lattice parameters, symmetry, and octahedral: rotations) of SrRuO3 films grown on substrates engineered to have the same lattice parameters, but different octahedral rotations. SrRuO3 films grown on SrTiO3 (001) (no octahedral rotations) and GdScO3 buffered SrTiO3 (001) (with octahedral rotations) substrates are found to exhibit monoclinic and tetragonal symmetry, respectively. Electrical transport and magnetic measurements reveal that the tetragonal films exhibit higher resistivity, lower magnetic Curie temperatures) and more isotropic magnetism as compared to those with monoclinic structure. Synchrotron-based quantification Of the octahedral rotation network reveals that the tilting pattern in both film variants is the same (albeit with slightly different magnitudes of in-plane rotation angles): The abnormal rotation pattern observed in tetragonal SrRuO3 indicates a possible decoupling between the internal octahedral rotation and lattice symmetry, which could provide new opportunities to engineer thin-film structure and properties.
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