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Tuning Crystal Field Potential by Orbital Dilution in $d^4$ Oxides

By Wojciech Brzezicki, Filomena Forte, Canio Noce, Mario Cuoco and Andrzej M. Oleś


We investigate the interplay between Coulomb driven orbital order and octahedral distortions in strongly correlated Mott insulators due to orbital dilution, i.e., doping by metal ions without an orbital degree of freedom. In particular, we focus on layered transition metal oxides and study the effective spin-orbital exchange due to $d^3$ substitution at $d^4$ sites. The structure of the $d^3-d^4$ spin-orbital coupling between the impurity and the host in the presence of octahedral rotations favors a distinct type of orbital polarization pointing towards the impurity and outside the impurity--host plane. This yields an effective lattice potential that generally competes with that associated with flat octahedra and, in turn, can drive an inversion of the crystal field interaction.Comment: 7 pages, 5 figures, accepted by Journal of Superconductivity and Novel Magnetis

Topics: Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Publisher: 'Springer Science and Business Media LLC'
Year: 2019
DOI identifier: 10.1007/s10948-019-05386-0
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