Spin-Electron-Phonon Excitation in Re-based Half-Metallic Double Perovskites

Details Spin-Electron-Phonon Excitation in Re-based Half-Metallic Double Perovskites Spin-Electron-Phonon Excitation in Re-based Half-Metallic Double Perovskites

2011-12-21

arxiv.org/abs/1112.5023v2

Phys. Rev. Lett. 108, 177202 (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.108.177202

A remarkable hardening (~ 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 anti-symmetric 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 local Fe or Cr 3d and Re 5d occupations and spin magnitudes.

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