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|Title:||Infrared 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.
Almeida, B. G.
|Keywords:||Ferromagnetism and anti-ferromagnetism|
|Journal:||Journal of Magnetism and Magnetic Materials|
|Citation:||Ribeiro, 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.|
|Access:||Restricted access (UMinho)|
|Appears in Collections:||CDF - FCD - Artigos/Papers (with refereeing)|
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