Superlattice-induced oscillations of interplanar distances and strain effects in the CrN/AlN system

Year: 
2017
Month: 
4
Day: 
5
Pages: 
ARTN 155305
DOI: 
10.1103/PhysRevB.95.155305
Type: 
Journal Articles
Journal: 
Physical Review B
Volume: 
95
Abstract: 

New physical phenomena and exciting material properties may be introduced by interfaces present in multilayers. Here, interplanar spacing oscillations in cubic CrN/AlN multilayers were experimentally observed by using spherical aberration-corrected high-resolution transmission electron microscopy, and corroborated by first-principles calculations. These oscillations are closely related to changes in the electronic structure. Electron spectroscopy and microscopy were employed to obtain generalized relationships between the electronic structure on the one hand, and (non-)stoichiometry or strains in the strained multilayers on the other hand, which are successfully interpreted by means of theoretical calculations. The present study may provide atomic-scale clues
on the mechanism of extraordinary strength pertaining to the CrN/AlN multilayers.