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@ARTICLE{Bertinshaw:455234,
      author       = {Bertinshaw, J. and Krautloher, Maximilian and Suzuki, H.
                      and Takahashi, Hiroto and Ivanov, A. and Yavaş, H. and Kim,
                      Bumjoon and Gretarsson, H. and Keimer, B.},
      title        = {{S}pin and charge excitations in the correlated multiband
                      metal ${C}a_{3}{R}u_{2}{O}_{7}$},
      journal      = {Physical review / B},
      volume       = {103},
      number       = {8},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {PUBDB-2021-00998},
      pages        = {085108},
      year         = {2021},
      abstract     = {We use Ru L$_3$-edge resonant inelastic x-ray scattering to
                      study the full range of excitations in Ca$_3$Ru$_2$O$_7$
                      from meV-scale magnetic dynamics through to the eV-scale
                      interband transitions. This bilayer 4d-electron correlated
                      metal expresses a rich phase diagram, displaying long-range
                      magnetic order below 56 K followed by a concomitant
                      structural, magnetic, and electronic transition at 48 K. In
                      the low-temperature phase, we observe a magnetic excitation
                      with a bandwidth of ∼30 meV and a gap of ∼8 meV at the
                      zone center, in excellent agreement with inelastic neutron
                      scattering data. The dispersion can be modeled using a
                      Heisenberg Hamiltonian for a bilayer S=1 system with
                      single-ion anisotropy terms. At a higher energy loss,
                      dd-type excitations show heavy damping in the presence of
                      itinerant electrons, giving rise to a fluorescencelike
                      signal appearing between the t$_{2g}$ and e$_g$ bands. At
                      the same time, we observe a resonance originating from
                      localized t$_{2g}$ excitations, in analogy to the
                      structurally related Mott insulator Ca$_2$RuO$_4$. But
                      whereas Ca$_2$RuO$_4$ shows sharp separate spin-orbit
                      excitations and Hund's-rule driven spin-state transitions,
                      here we identify only a single broad asymmetric feature.
                      These results indicate that local intraionic interactions
                      underlie the correlated physics in Ca$_3$Ru$_2$O$_7$, even
                      as the excitations become strongly mixed in the presence of
                      itinerant electrons.},
      cin          = {DOOR ; HAS-User / MPG / FS-PET-S},
      ddc          = {530},
      cid          = {I:(DE-H253)HAS-User-20120731 / I:(DE-H253)MPG-20120806 /
                      I:(DE-H253)FS-PET-S-20190712},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      Com4Com - Collective modes in 4d-metal compounds and
                      heterostructures (669550)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      G:(EU-Grant)669550},
      experiment   = {EXP:(DE-H253)P-P01-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000615717100002},
      doi          = {10.1103/PhysRevB.103.085108},
      url          = {https://bib-pubdb1.desy.de/record/455234},
}