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Gnezdilov, V., Lemmens, P., Pashkevich, Y. G., Payen, C., Choi, K. Y., Hemberger, J., Loidl, A. & Tsurkan, V. (2011) Phonon anomalies and possible local lattice distortions in giant magnetocapacitive CdCr2S4. Phys. Rev. B, 84 045106. 
Added by: Laurent Cournède (2016-03-10 21:32:20)
Type de référence: Article
DOI: 10.1103/PhysRevB.84.045106
Numéro d'identification (ISBN etc.): 1098-0121
Clé BibTeX: Gnezdilov2011
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Catégories: MIOPS
Mots-clés: ferroelectricity, films, magnetoelectric multiferroics, nanostructures, phase-transition, polarization, progress, raman-scattering, relaxor, vibration-spectra
Créateurs: Choi, Gnezdilov, Hemberger, Lemmens, Loidl, Pashkevich, Payen, Tsurkan
Collection: Phys. Rev. B
Consultations : 10/395
Indice de consultation : 2%
Indice de popularité : 0.5%
Résumé     
We investigate the origin of large magnetocapacitive effects in CdCr2S4 single crystals focusing on phonon anomalies in the fluctuation regime T {<} T* = 130 K and with the onset of ferromagnetic order T-c = 84.4 K. The observation of longitudinal optical and formerly infrared active modes for T {<} T-c is used to propose a loss of inversion symmetry and Cr off-centering. Further anomalies in intensity, frequency, and linewidth have an onset temperature T* that coincides with the onset of magnetocapacitive effects. The respective intensity anomalies are attributed in part to an enhanced electronic polarizability of displacements that modulate the Cr-S distance and respective hybridization. This is taken as a prerequisite to the proposed Cr off-centering. Anomalies due to the previously disregarded photodoping and resonance are analyzed comparing different excitation energies.
Added by: Laurent Cournède  
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