Charge-density-wave-phase-mode evidence in one-dimensional K 0.3 MoO 3
Charge-density-wave-phase-mode evidence in one-dimensional K 0.3 MoO 3
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DOI：
10.1103/physrevb.30.1971
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发表时间：
1984-08
影响因子：
3.7
通讯作者：
G. Travaglini;P. Wachter
中科院分区：
文献类型：
--
作者：
G. Travaglini;P. Wachter
在远红外区的反射率测量无可辩驳地显示的后果Peierls不稳定性的蓝青铜K 0.3 MoO 3系统。在5 K，观察到一个非常强的极化相关的声子谱：在光子能量低于8 meV，一个巨大的，几乎无阻尼的结构占主导地位的沿着B轴极化的整个光谱。该结构达到97%的反射率，被认为是钉扎的Fröhlich电荷密度波（CDW）（A-）模式的振荡。通过Kramers-Kronig关系计算了光学常数。将结果与平均场理论的预测（m CDW*，λ，Tc MF）以及K2 Pt（CN）4 Br0.3· 3 H2 O（KCP）的实验结果进行了比较。没有观察到（A-）模或CDW能量损失谱的软化。带隙吸收与孤子（CDW晶格中的位错）的存在有关，并将结合非欧姆电导率的最新结果进行讨论。
Reflectivity measurements in the far-infrared region irrefutably show the consequence of the Peierls instability in the blue bronze K 0.3 MoO 3 system. At 5 K, a very strong polarization-dependent phonon spectrum is observed: At photon energies below 8 meV, a giant, nearly undamped structure dominates the whole spectrum polarized along the b axis. The structure, reaching reflectivity values of 97%, is assigned to the oscillation of the pinned Fröhlich charge-density-wave (CDW)(A−) mode. Optical constants are calculated by means of the Kramers-Kronig relation. The results are compared to the predictions of mean-field theory (m CDW*, λ, T c MF) and to the experimental results on K 2 Pt (CN) 4 Br 0.3· 3 H 2 O (KCP). No softening of the (A−) mode or of the CDW energy-loss spectrum was observed. A midgap absorption can be related to the presence of solitons (dislocations in CDW lattice) and will be discussed with the latest results on the non-Ohmic conductivity.