Abstract
Doping with Ti stabilizes the corundum paramagnetic metallic phase and restricts the transition to the monoclinic antiferromagnetic insulating phase at lower temperatures. In this study, we investigated the dependence of phase stability on Ti concentration for nanocrystals as small as 20 nm. Ti doping of several percent induces a high-temperature insulating phase preserving the magnetic transition without the crystal symmetry change. The emergence of the insulating phases, which are peculiar to this crystal size, can be attributed to the enhancement of the on-site Coulomb interaction and increased mixing between and states accompanied by characteristic lattice parameter changes in the high Ti doping region.
- Received 31 October 2018
- Revised 11 December 2019
DOI:https://doi.org/10.1103/PhysRevB.101.035415
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