Contrasting pressure evolution of f-electron hybridized states in CeRhIn5 and YbNi3Ga9: An optical conductivity study
Contrasting pressure evolution of f-electron hybridized states in CeRhIn5 and YbNi3Ga9: An optical conductivity study
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CeRhIn5 和 YbNi3Ga9 中 f 电子杂化态的对比压力演化：光学电导率研究
DOI：
10.1103/physrevb.100.195112
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发表时间：
2019
影响因子：
3.7
通讯作者：
Moriwaki T.
中科院分区：
文献类型：
--
作者：
Okamura H.;Takigawa A.;Yamasaki T.;Bauer E. D.;Ohara S.;Ikemoto Y.;Moriwaki T.
在10 GPa的外压和6 K的低温下测量了和的光导率.在常压下，由于自由载流子的存在，其主要特征是一个Drude峰。然而，随着压力的增加，特征中红外（mIR）峰迅速发展，其峰值能量和宽度随压力增加。这些特征与高压下导电电子杂化的增加是一致的，表明压力已经将电子态从很弱的杂化状态调谐到强杂化状态。相反，在环境压力下已经观察到显著的mIR峰，表明强杂化。然而，在高压下，mIR峰移动到较低的能量，并变得减少，似乎合并与德鲁德组件在10 GPa。也就是说，电子结构和压强的演化呈现出相反的趋势.这些结果进行了讨论方面的压力演化ofhybridized电子态在Ce和Yb的化合物，特别是在电子空穴对称性往往被认为是Ce和Yb之间。
Optical conductivityofandhave been measured at external pressures to 10 GPa and at low temperatures to 6 K. Regarding, at ambient pressure the main feature inis a Drude peak due to free carriers. With increasing pressure, however, a characteristic midinfrared (mIR) peak rapidly develops in, and its peak energy and width increase with pressure. These features are consistent with an increased conduction ()-electron hybridization at high pressure and show that pressure has tuned the electronic state offrom very weakly to strongly hybridized ones. As for, in contrast, a marked mIR peak is observed already at ambient pressure, indicating a stronghybridization. At high pressures, however, the mIR peak shifts to lower energy and becomes diminished and seems to merge with the Drude component at 10 GPa. Namely,andexhibit some opposite tendencies in the pressure evolution ofand electronic structure. These results are discussed in terms of the pressure evolution ofhybridized electronic states in Ce and Yb compounds, in particular in terms of the electron-hole symmetry often considered between Ce and Yb.