Optical Spectroscopy in CoO: Phonons, Electric, and Magnetic Excitations

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dc.creatorKant, Ch.
dc.creatorRudolf, T.
dc.creatorSchrettle, F.
dc.creatorMayr, F.
dc.creatorDeisenhofer, J.
dc.creatorLunkenheimer, P.
dc.creatorEremin, M. V.
dc.creatorLoidl, A.
dc.date2008-09-05
dc.date.accessioned2026-07-07T12:31:23Z
dc.date.available2026-07-07T12:31:23Z
dc.descriptionThe reflectivity of single-crystalline CoO has been studied by optical spectroscopy for wave numbers ranging from 100 to 28,000\wn and for temperatures 8 $< T <$ 325 K\@. A splitting of the cubic IR-active phonon mode on passing the antiferromagnetic phase transition at $T_N$ = 289 K has been observed. At low temperatures the splitting amounts to 15.0\wn. In addition, we studied the splitting of the cubic crystal field ground state of the Co$^{2+}$ ions due to spin-orbit coupling, a tetragonal crystal field, and exchange interaction. Below $T_N$, magnetic dipole transitions between the exchange-split levels are identified and the energy-level scheme can be well described with a spin-orbit coupling $λ= 151.1\wn$, an exchange constant $J = 17.5\wn$, and a tetragonal crystal-field parameter $D = -47.8\wn$. Already in the paramagnetic state electric quadrupole transitions between the spin-orbit split level have been observed. At high frequencies, two electronic levels of the crystal-field-split $d$-manifold were identified at 8,000 and 18,500\wn.
dc.description12 pages, 8 figures, 2 tables
dc.identifierhttps://arxiv.org/abs/0809.0997
dc.identifierhttp://arxiv.org/abs/0809.0997
dc.identifierPhys. Rev. B 78, 245103 (2008)
dc.identifierdoi:10.1103/PhysRevB.78.245103
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/216428
dc.subjectStrongly Correlated Electrons
dc.titleOptical Spectroscopy in CoO: Phonons, Electric, and Magnetic Excitations
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