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@ARTICLE{Zhang:885415,
      author       = {Zhang, Guoren and Pavarini, Eva},
      title        = {{H}iggs mode and stability of x y -orbital ordering in {C}a
                      2 {R}u{O} 4},
      journal      = {Physical review / B},
      volume       = {101},
      number       = {20},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      reportid     = {FZJ-2020-03812},
      pages        = {205128},
      year         = {2020},
      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
                      $Ca_{2}RuO_{4}$.},
      ddc          = {530},
      pnm          = {Charge-transfer effects in multi-orbital correlated systems
                      $(jiff46_20191101)$},
      pid          = {$G:(DE-Juel1)jiff46_20191101$},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/PhysRevB.101.205128},
      url          = {https://juser.fz-juelich.de/record/885415},
}