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arXiv 0706.2089cond-mat.str-el
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电子关联驱动LiV2O4中重费米子的形成

Electron Correlation Driven Heavy-Fermion Formation in LiV2O4

P. E. Jönsson, K. Takenaka, S. Niitaka, T. Sasagawa, S. Sugai, H. Takagi

摘要:

光学反射率的测量上进行的d-电子重费米子(HF)金属LiV 2 O 4的单晶。结果表明,在T^* \approx 20 K以上的所有温度下,电荷动力学都具有高度非相干的特征。当载流子的量子相干性恢复时,光学电导率的光谱权重在极宽的能量尺度(~ 5 eV)上重新分布。这种广泛的再分配,形成鲜明对比的f-电子近藤晶格HF系统,金属系统的特点接近相关驱动的绝缘状态。因此,我们的研究结果表明,强电子关联效应主导的低能电荷动力学和重准粒子形成的LiV 2 O 4。我们提出的几何挫折,这限制了扩展的电荷和自旋排序,作为一个额外的关键成分的低温重费米子形成在这个系统中。

英文摘要:

Optical reflectivity measurements were performed on a single crystal of the d-electron heavy-fermion (HF) metal LiV2O4. The results evidence the highly incoherent character of the charge dynamics for all temperatures above T^* \approx 20 K. The spectral weight of the optical conductivity is redistributed over extremely broad energy scales (~ 5 eV) as the quantum coherence of the charge carriers is recovered. This wide redistribution is, in sharp contrast to f-electron Kondo lattice HF systems, characteristic of a metallic system close to a correlation driven insulating state. Our results thus reveal that strong electronic correlation effects dominate the low-energy charge dynamics and heavy quasiparticle formation in LiV2O4. We propose the geometrical frustration, which limits the extension of charge and spin ordering, as an additional key ingredient of the low-temperature heavy-fermion formation in this system.

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