Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/43636

TitleInfrared reflectivity investigation of the phase transition sequence in Pr0.5Ca0.5MnO3
Author(s)Ribeiro, José Luís Pires
Vieira, L. G.
Gomes, I. T.
Araujo, J. P.
Tavares, P.
Almeida, B. G.
KeywordsFerromagnetism and anti-ferromagnetism
Orbital order
Spin-lattice coupling
Optical conductivity
Infrared spectroscopy
Issue date2016
PublisherElsevier
JournalJournal of Magnetism and Magnetic Materials
CitationRibeiro, J. L., Vieira, L. G., Gomes, I. T., Araujo, J. P., Tavares, P., & Almeida, B. G. (2016). Infrared reflectivity investigation of the phase transition sequence in Pr0.5Ca0.5MnO3. Journal of Magnetism and Magnetic Materials, 408, 81-88. doi: 10.1016/j.jmmm.2016.02.026
Abstract(s)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.
TypeArticle
URIhttp://hdl.handle.net/1822/43636
DOI10.1016/j.jmmm.2016.02.026
ISSN0304-8853
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:CDF - FCD - Artigos/Papers (with refereeing)

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