2006/09/19 by R. Sopracase, G. Gruener, Sopracase, R. +12
Engineering · Materials Science · Physics and Astronomy · #Electronic and Structural Properties of Oxides #FOS: Physical sciences #Gas Sensing Nanomaterials and Sensors #Magnetic and transport properties of perovskites and related materials #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0609451
7 pages, 4 figures, submited to Europhysics Letters
arxiv created 2006/09/19 · openalex publication_date 2006/09/19 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The optical conductivity of the undoped PrMnO3 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 ∼ 2 eV. This peak is interpreted in terms of an indirect interband transition between the split bands eg 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 PrMnO3, 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.