| Jahn-Teller Distortions Cooperating with Magnetic Interaction in the Raman Spectra of La0.75Ca0.25MnO3 Thin Film |
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| 作者姓名： | 刘勇 冯双久 李晓光 |
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| 作者单位： | [1]StructureResearchLaboratory,DepartmentofMaterialsScienceandEngineering,UniversityofScienceandTechnologyofChina,Hefei230026 [2]Towhomcorrespondenceshouldbeaddressed.,DepartmentofMaterialsScienceandEngineering,UniversityofScienceandTechnologyofChina,Hefei230026 |
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| 摘 要： | Remarkable changes (additional peaks, frequency shift, and peak width) of Raman spectra ofa La0.75 Ca0.25MnO3 thin film have been observed during the paramagnetic insulator-ferromagnetic metal transition. The vl band (230cm^-1) hardens by lattice contraction as a result of the rearrangement of Mn06 octahedra. The Jahn-Teller distortions seem to be responsible for the broadening of v2 band (485 cm^-1) above the magnetic transition temperature Tc. It is proposed that the 438cm-1 vibration mode activated in the magnetic ordering state is associated with the rearrangement of MnO6 octahedra. The softening of v3 band (610cm^-1) below TC can be ascribed to the magnetic interaction that brings into spin-phonon coupling terms.
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| 关 键 词： | 拉曼光谱 La0.75Ca0.25MnO3薄膜 镧钙锰氧化物薄膜 Jahn-Teller畸变 磁性 磁相互作用 声子模型 晶格畸变 |
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