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首页> 外文期刊>Physica status solidi, B. Basic research >Raman Scattering Studies of the Carbon Atom Vibrations in Superconducting Rare-Earth Carbide Halides RE_2C_2(X,X')_2 (RE=Y, Gd; X, X'=Br, I)
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Raman Scattering Studies of the Carbon Atom Vibrations in Superconducting Rare-Earth Carbide Halides RE_2C_2(X,X')_2 (RE=Y, Gd; X, X'=Br, I)

机译：超导稀土碳化物RE_2C_2（X，X'）_ 2（RE = Y，Gd; X，X'= Br，I）中碳原子振动的拉曼散射研究

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摘要

The Raman spectra of the layered superconductors RE_2C_2(X,X')_2 (RE = Y, Gd; X, X' = Br, I) were measured on single-crystal and polycrystalline specimens using a micro-Raman technique. Low energy modes (#omega# < 300 cm~(-1)) correspond to mixed vibrations of rare-earth and halogen atom sublattices. Two high energy modes at approx= 400 and approx= 1600 cm~(-1) can be assigned to the tilting and stretching vibrations of the carbon C_2 units. These carbon-related phonons were identified by analyzing the isotope shifts of the Raman lines in samples in which the natural carbon was replaced by isotope-enriched ~(13)C. The energy of the stretching vibration is independent of the particular host compound while the energy of the tilting vibration correlates with the size of the rare-earth atom cage that surrounds the carbon atoms.
机译：使用微拉曼技术在单晶和多晶样品上测量了层状超导体RE_2C_2（X，X'）_ 2（RE = Y，Gd; X，X'= Br，I）的拉曼光谱。低能模式（＃omega＃<300 cm〜（-1））对应于稀土和卤素原子亚晶格的混合振动。可以为碳C_2单元的倾斜和拉伸振动分配大约400和大约1600 cm〜（-1）的两个高能模式。这些碳相关的声子是通过分析样品中拉曼谱线的同位素位移来确定的，其中样品中的自然碳被富含同位素的〜（13）C代替。拉伸振动的能量与特定的主体化合物无关，而倾斜振动的能量与包围碳原子的稀土原子笼的尺寸相关。

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