Journal
PHYSICAL REVIEW B
Volume 99, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.115401
Keywords
-
Funding
- National Natural Science Foundation of China [11574281, 51501143]
- Anhui Provincial Natural Science Foundation [1608085MA18]
- Fundamental Research Funds for the Central Universities
Ask authors/readers for more resources
Combining atomic-resolution scanning transmission electron microscopy (STEM) images and electron-energy-loss spectroscopy spectra in aberration-corrected STEM, first-principle calculations, and spectra simulations, we investigate the origin of the surface state in a LaCoO3 nanoparticle. We show that a LaCoO3 nanoparticle appears as the core-shell structure, where the core has the mixture of low-and high-spin states and the shell has increased concentration of the high-spin state. Based on experimental observations and theoretical calculations, we propose that it is neither the oxygen vacancy nor strain but the suppression of oxygen octahedral tilting due to surface reconstruction that plays a dominant role in the spin-state crossover to the higher-spin state at the surface. These results provide great insights into understanding the origin of ferromagnetism as well as the enhanced electrocatalytic activity in this compound.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available