Raman study of the metal-insulator transition in pyrochlore Mo oxides
Raman study of the metal-insulator transition in pyrochlore Mo oxides
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DOI：
10.1103/physrevb.70.100401
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发表时间：
2004-09
影响因子：
3.7
通讯作者：
K. Taniguchi;T. Katsufuji;S. Iguchi;Y. Taguchi;H. Takagi;Y. Tokura
中科院分区：
文献类型：
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作者：
K. Taniguchi;T. Katsufuji;S. Iguchi;Y. Taguchi;H. Takagi;Y. Tokura
本文研究了关联电子系统（，）的拉曼散射谱，该系统随稀土离子或等效单电子带宽的变化而经历金属-绝缘体转变。发现金属相（，）中出现了几个调制键角的声子峰，而绝缘相（，）中的声子峰强度受到明显抑制。这一结果表明，声子模式的耦合与电子-空穴激发跨越费米能级，从而探测灵敏的低能量电荷动力学在附近的带宽控制的莫特转变。
Raman scattering spectra have been investigated for the correlated-electron system,(,,,,,), which undergoes a metal-insulator transition with changing the rare-earth ion, or equivalently the one-electron bandwidth. It is found that several phonon peaks modulating thebond angle appear in the metallic phase (,,,), whereas they are remarkably suppressed in intensity in the insulating phase (,). This result indicates that the phonon modes ofare coupled with the electron-hole excitation across the Fermi level, thus probing sensitively the low-energy charge dynamics in the vicinity of the bandwidth-control Mott transition.