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Prediction of orbital ordering in single-layered ruthenates

Hotta, Takashi; Dagotto, E.*

The key role of the orbital degree of freedom to understand the magnetic properties of layered ruthenates is here discussed. In the G-type antiferromagnetic (AFM) phase of Ca$$_2$$RuO$$_4$$, recent X-ray experiments reported the presence of 0.5 hole per site in the $$d_{rm xy}$$ orbital, while the $$d_{rm yz}$$ and $$d_{rm zx}$$ orbitals contain 1.5 holes. This unexpected $$t_{rm 2g}$$ hole distribution is explained by a novel state with orbital ordering (OO), stabilized by a combination of Coulomb interactions and lattice distortions. In addition, the rich phase diagram presented here suggests the possibility of large magnetoresistance effects, and predicts a new ferromagnetic OO phase in ruthenates.

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Category:Physics, Multidisciplinary

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