Can oxygen vacancy defects lead to emergence of magnetic ordering in perovskite nanostructures even if does not show any magnetic characteristic from ZFC-FC measurement but possess a significant coercivity around 1300 Oe from M-H measurement?
Have a look under the topic of Jahn-Teller distortions.
Take a look at this article, I feel this is just what you need
https://www.researchgate.net/project/Investigating-magnetic-properties-of-doped-cerium-oxide-nanoparticles
Regards
If time reversal symmetry is broken with O2 vacancies new magnetic order may emerge. Of course, it is complicated particularly in oxides.
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