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首页> 外文会议>Symposium on Science and Technology of Magnetic Oxides December 1-4, 1997, Boston, Massachusetts, U.S.A. >Raman investigation of the layered manganese perovskite La_(1.2)Sr_(1.8)Mn_2O_7
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Raman investigation of the layered manganese perovskite La_(1.2)Sr_(1.8)Mn_2O_7

机译：层状钙钛矿型La_（1.2）Sr_（1.8）Mn_2O_7的拉曼研究

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摘要

We report the results of a detailed polarization and temperature dependence study of the Raman scattering from La_(1.2)Sr_(1.8)Mn_2O_7. The Raman spectra reveal three general spectral features. First, there are sharp peaks due to long-wavelength optic phonons. Phonons, attributed to the distortion of the MnO_6 octahedra, reveal an anomablous behavior which correlates with the transition from a paramagnetic-insulating (PI) to a ferromagnetic-metallic (FM) phase at a critical temperature T_c. Second, there is an electronic continuum that is suppressed for omega <500 cm~(-1) at TT_c. Third, broad peaks between 400 cm~(-1) to 800 cm`(-1) seen in the PI state, surprisingly, disappear in the FM state. The implications of these results are discussed.
机译：我们报告了从La_（1.2）Sr_（1.8）Mn_2O_7拉曼散射的详细极化和温度依赖性研究的结果。拉曼光谱揭示了三个一般的光谱特征。首先，由于长波长的光子产生尖锐的峰。声子归因于MnO_6八面体的变形，显示出异常现象，该现象与临界温度T_c下从顺磁绝缘（PI）到铁磁金属（FM）相的过渡有关。其次，存在一个电子连续体，在T << T_c时欧米茄<500 cm〜（-1）被抑制。第三，令人惊奇的是，在PI状态下在400cm-1（-1）至800cm-1（-1）之间的宽峰消失了。讨论了这些结果的含义。

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