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Type: Artigo de periódico
Title: Spin-Electron-Phonon Excitation in Re-based Half-Metallic Double Perovskites
Author: Garcia-Flores, AF
Moreira, AFL
Kaneko, UF
Ardito, FM
Terashita, H
Orlando, MTD
Gopalakrishnan, J
Ramesha, K
Granado, E
Abstract: A remarkable hardening (similar to 30 cm(-1)) of the normal mode of vibration associated with the symmetric stretching of the oxygen octahedra for the Ba2FeReO6 and Sr2CrReO6 double perovskites is observed below the corresponding magnetic ordering temperatures. The very large magnitude of this effect and its absence for the antisymmetric stretching mode provide evidence against a conventional spin-phonon coupling mechanism. Our observations are consistent with a collective excitation formed by the combination of the vibrational mode with oscillations of Fe or Cr 3d and Re 5d occupations and spin magnitudes.
Country: EUA
Editor: Amer Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevLett.108.177202
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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