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| Journal Article | FZJ-2020-03812 |
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2020
Woodbury, NY
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Please use a persistent id in citations: doi:10.1103/PhysRevB.101.205128
Abstract: We investigate the stability of xy orbital ordering and the nature of the magnetic longitudinal excitations in $Ca_{2}RuO_{4}$. To this end, we employ the local-density approximation + dynamical mean-field theory approach, in combination with many-body perturbation theory. We show that the crossover to a nonperturbative spin-orbit regime—-in which xy-like orbital ordering is to a large extent quenched—only takes place when the crystal field is sizably reduced with respect to its actual value in $Ca_{2}RuO_{4}$. In the small crystal-field splitting limit, the spin-orbit interaction favors the metal-to-insulator transition. We find that the effects of the spin-orbit interaction remain perturbative even for the less distorted $Ca_{2−x}Sr_xRuO_4$ with 0< x<0,2 ($S$-Pbca phase) and for the $S^∗$ phase. We show that, nevertheless, a Higgs mode at ω∼50meV is compatible with xy-like orbital ordering in $Ca_{2}RuO_{4}$.
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