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利用常规的固相合成法制备了三种Sr14(Cu1-yFey)24O41(y=0,0.03,0.05)多晶样品,其中y=0.03是单纯Fe3+掺杂,y=0.05是Fe3+和Fe2+混合掺杂.在100—1500cm-1频移范围内测量了这三种样品的偏振拉曼光谱.首先,通过与同类结构化合物的谱线比较,确定了在由两个子晶格组成的简单Fmmm结构样品中,拉曼光谱的测量存在(4Ag+4B1g+3B2g+B3g)模式.其次,实验观察到这三种样品都在1170cm-1附近出现一弱峰,解释为非拉曼散射的红外活性的纵光学声子模,其中峰强的变化反映了空穴在自旋链与自旋梯之间的重新分布.导电性较强的y=0.03样品在1170cm-1附近的散射峰强度十分微弱,原因是CuO2自旋链上的空穴转移到了Cu2O3自旋梯上.
Three kinds of Sr14 (Cu1-yFey) 24O41 (y = 0,0.03,0.05) polycrystalline samples were prepared by the conventional solid-state synthesis method, in which y = 0.03 was simple Fe3 + doping, y = 0.05 was mixed Fe3 + and Fe2 + The polarization Raman spectra of these three samples were measured in the frequency range of 100-1500 cm-1 .Firstly, by comparing with the spectral lines of the same type of structure compounds, it was confirmed that in the simple Fmmm structure samples composed of two sub-lattices , There is (4Ag + 4B1g + 3B2g + B3g) mode for the measurement of Raman spectrum.Secondly, we observed that all three samples showed a weak peak near 1170cm-1, which was interpreted as the non-Raman scattering infrared activity Optical phonon mode, in which the change of the peak intensity reflects the redistribution of holes between the spin chain and the spin ladder. The intensity of the scattering peak near 1170 cm-1 of y = 0.03 with strong conductivity is very weak because The holes on the CuO2 spin chain are transferred to the Cu2O3 spin ladder.