Title :
Threading dislocations in La0.67Sr0.33MnO3/SrTiO3 superlattice
Author :
Ming He ; Long Lin ; Hualong Tao ; Minghui Qiu ; Binyan Zou ; Zhihua Zhang
Author_Institution :
Dept. of Phys., Dalian Jiaotong Univ., Dalian, China
Abstract :
Transmission electron microscopy-related experiments were performed on a La0.67Sr0.33MnO3/SrTiO3 superlattice. The predominant defects in the superlattice are a high density of threading dislocations (TDs) perpendicular or quasi-perpendicular to the substrate surface. The TDs are mostly pure-edge-type with Burgers vectors b = 〈100〉 or 〈110〉. A few TDs of screw character with Burgers vectors ± [001] were also found. Electron energy loss spectra show that non-stoichiometry is accommodated in the near-interface region of the superlattice. The stronger crystal field induced by defect and non-stoichiometry are accounted for by the observed macroscopic properties.
Keywords :
crystal field interactions; dislocations; electron energy loss spectra; lanthanum compounds; strontium compounds; superlattices; transmission electron microscopy; Burgers vectors; La0.67Sr0.33MnO3-SrTiO3; crystal field; density; electron energy loss spectra; nonstoichiometry; predominant defects; superlattice; threading dislocations; transmission electron microscopy;
Journal_Title :
Micro & Nano Letters, IET
DOI :
10.1049/mnl.2013.0411
