ChemInform Abstract: Strongly‐Correlated Crystal‐field Approach to 3d Oxides — The Orbital Magnetism in 3d‐Ion Compounds

Radwański, R. J.; Ropka, Z.

doi:10.1002/chin.200921214

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2009

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“…The solid line in Fig. 7 is a sum of both contributions and a small linear term, which accounts for the thermal expansion and is found to be of the order of 5 mJ mol −1 K −1 [65]. The obtained results nicely reproduces the experimental data at low and elevated temperatures.…”

Section: Coosupporting

confidence: 74%

Spin-phonon coupling in highly correlated transition-metal monoxides

Kant

Mayr

Rudolf

et al. 2009

Eur. Phys. J. Spec. Top.

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We report on the optical response of the highly correlated transitionmetal monoxides MnO, FeO, CoO and NiO in the far-infrared regime. The main focus is put on spin-phonon coupling effects, which are found to significantly influence the lattice dynamics in the magnetically ordered phase. Measurements have been performed in the ordered and paramagnetic state for temperatures up to 550 K. A clear splitting of the cubic mode accompanying the transition into long range magnetic order can be identified in MnO, CoO and NiO. In the case of FeO it is argued that an anisotropic phonon response seems to be very likely, though it could not be observed directly. The results are compared to recent experimental and theoretical studies in frustrated magnets, which predict the splitting of zone center phonon modes induced by a non-cubic spin-density distribution.

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Section: Coosupporting

confidence: 74%