Optical response to magnetic ordering in PrMnO_3: the relevance of the double exchange interaction

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dc.creatorSopracase, R.
dc.creatorGruener, G.
dc.creatorAutret-Lambert, C.
dc.creatorPhuoc, V. Ta
dc.creatorBrize, V.
dc.creatorSoret, J. C.
dc.date2006-09-19
dc.date.accessioned2026-07-07T07:23:36Z
dc.date.available2026-07-07T07:23:36Z
dc.descriptionThe optical conductivity of the undoped PrMnO$_3$ manganite has been investigated in details at various temperatures between 300 and 4 K. Its low energy spectrum exhibits an optical gap, and is characterized by a single broad peak centered at $\sim$ 2 eV. This peak is interpreted in terms of an indirect interband transition between the split bands $e_\text{g}$ caused by a strong electron Jahn-Teller phonon coupling. The spectral weight of this transition is found to be related to the magnetic ordering, which consists of ferromagnetic planes coupled antiferromagnetically. We show that such a 2D ferromagnetism plays, via the double exchange interaction, an essential role in the electronic properties of PrMnO$_3$, which is a 3D antiferromagnetic compound. Finally, an excess of optical spectral weight is found above the Néel temperature, and is attributed to ferromagnetic fluctuations. A signature of such fluctuations is equally found from electron spin resonance experiments.
dc.description7 pages, 4 figures, submited to Europhysics Letters
dc.identifierhttps://arxiv.org/abs/cond-mat/0609451
dc.identifierhttp://arxiv.org/abs/cond-mat/0609451
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/116041
dc.subjectStrongly Correlated Electrons
dc.titleOptical response to magnetic ordering in PrMnO_3: the relevance of the double exchange interaction
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