Infrared reflectivity investigation of the phase transition sequence in Pr0.5Ca0.5MnO3
| Autor: | Pedro B. Tavares, I. T. Gomes, L. G. Vieira, João P. Araújo, José Luís Pires Ribeiro, Bernardo Almeida |
|---|---|
| Přispěvatelé: | Universidade do Minho |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Phase transition Sequence Science & Technology Ciências Naturais::Ciências Físicas business.industry Ciências Físicas [Ciências Naturais] Ferromagnetism and anti-ferromagnetism Infrared reflectivity Optical conductivity 02 engineering and technology Orbital order Spin-lattice coupling 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Engineering physics Electronic Optical and Magnetic Materials Optics 0103 physical sciences 010306 general physics 0210 nano-technology business Infrared spectroscopy |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| ISSN: | 0304-8853 |
| Popis: | This work reports an infrared reflectivity study of the phase transition sequence observed in Pr0.5Ca0.5MnO3. The need to measure over an extended spectral range in order to properly take into account the effects of the high frequency polaronic absorption is circumvented by adopting a simple approximate method, based on the asymmetry present in the Kramers Kronig inversion of the phonon spectrum. The temperature dependence of the phonon optical conductivity is then investigated by monitoring the behavior of three relevant spectral moments of the optical conductivity.This combined methodology allows us to disclose subtle effects of the orbital,charge and magnetic orders on the lattice dynamics of the compound.The characteristic transition temperatures inferred from the spectroscopic measurements are compared and correlated with those obtained from the temperature dependence of the induced magnetization and electrical resistivity. This work was supported by the Portuguese Foundation for Science and Technology (FCT)in the framework of the Strategic Projects of CFUM [PEst-C/FIS/UI0607/2013 (F-COMP-01-0124-FEDER-022711)]. |
| Databáze: | OpenAIRE |
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