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20 April 2024 |
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Optical response to magnetic ordering in PrMnO_3: the relevance of the double exchange interaction | | R. Sopracase
; G. Gruener
; C. Autret-Lambert
; V. Ta Phuoc
; V. Brize
; J.C. Soret
; | | Date: |
19 Sep 2006 | | Subject: | Strongly Correlated Electrons | | Abstract: | The 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 $e_ ext{g}$ 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 N’eel temperature, and is attributed to ferromagnetic fluctuations. A signature of such fluctuations is equally found from electron spin resonance experiments. | | Source: | arXiv, cond-mat/0609451 | | Services: | Forum | Review | PDF | Favorites | |
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