期刊
PHYSICAL REVIEW B
卷 80, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.134424
关键词
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资金
- Canadian Institute for Advanced Research
- Canada Foundation for Innovation
- Natural Sciences and Engineering Research Council (Canada)
- Fonds Quebecois pour la Recherche sur la Nature et les Technologies (Quebec)
- Universite de Sherbrooke
We report the influence of Ni/Mn ordering on the spin-phonon coupling in multifunctional La2NiMnO6. Three types of films with different levels of structural order, including long-range Ni/Mn cation order, cation disorder, and an admixture of the ordered and disordered phases are compared by polarized micro-Raman spectroscopy and magnetometry. Each film displays a strong dependence on the polarization configuration and a unique set of Raman-active phonon excitations. Long-range cation ordering results in the splitting of Raman-active phonon peaks because of Brillouin-zone folding and lowering symmetry. Phonon mode softening begins clearly at a distinct temperature for each sample revealing a strong spin-lattice interaction. It follows closely the magnetization curve in ordered films. Unlike the admixture and the ordered films, softening behavior is strongly suppressed in the cation-disordered films. These differences may be understood based on the variation in amplitude of the spin-spin correlation functions due to the local Ni/Mn cation ordering.
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