Determination of the Fermi velocity by angle-dependent periodic orbit resonance measurements in the organic conductor α − ( BEDT − TTF ) 2 KHg ( SCN ) 4
Determination of the Fermi velocity by angle-dependent periodic orbit resonance measurements in the organic conductor α − ( BEDT − TTF ) 2 KHg ( SCN ) 4
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通过有机导体中与角度相关的周期轨道共振测量来确定费米速度 α − ( BEDT − TTF ) 2 KHg ( SCN ) 4
DOI：
10.1103/physrevb.66.134513
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发表时间：
2002
影响因子：
3.7
通讯作者：
J. Qualls
中科院分区：
文献类型：
--
作者：
A. Kovalev;S. Hill;J. Qualls
我们报告了有机电荷密度波（CDW）导体单晶样品的微波 $(\ensuremath{\nu}=50\char21{}90\mathrm{GHz})$ 层间磁电动力学的详细角度相关研究$\ensuremath{\alpha}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}\mathrm{KHg}(\mathrm{SCN}{)}_{4}.$最近开发的仪器可实现固定样本方向的磁场$(\mathbf{B})$扫描和固定样本方向的角度扫描$\ensuremath{\nu}/\mathbf{B}.$ 我们观察到一系列共振吸收，我们将其归因于周期轨道共振（POR）\char22{}一种与回旋加速器共振密切相关的现象。 POR 的角度依赖性表明它们与标题化合物的低温准一维 (Q1D) 费米面 (FS) 相关；事实上，所有共振峰都塌陷到一组 $\ensuremath{\nu}/\mathbf{B}$ 与角度曲线上，该曲线是使用单个 Q1D FS 的半经典磁输运理论生成的。我们证明，Q1D POR 测量提供了确定费米速度的最直接方法之一，无需任何有关能带结构的详细假设；我们的分析得出平均值为 ${v}_{F}=6.5\ifmmode\times\else\texttimes\fi{}{10}^{4}\mathrm{m}/\mathrm{s}。$ POR 谐波含量的定量分析表明 Q1D FS 具有强烈的波纹。这与低温 FS 源自由 CDW 不稳定性引起的高温准二维 FS 重建的假设是一致的。对 POR 角度依赖性的详细分析产生了与 CDW 上部结构相关的参数，这与已发表的结果一致。最后，我们解决了标题化合物中层间电动力学是否一致的问题。我们从 POR 线宽获得弛豫时间，该时间比层间跳跃时间长得多，表明该方向上的传输是相干的。
We report on detailed angle-dependent studies of the microwave $(\ensuremath{\nu}=50\char21{}90\mathrm{GHz})$ interlayer magnetoelectrodynamics of a single crystal sample of the organic charge-density-wave (CDW) conductor $\ensuremath{\alpha}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}\mathrm{KHg}(\mathrm{SCN}{)}_{4}.$ Recently developed instrumentation enables both magnetic-field $(\mathbf{B})$ sweeps for a fixed sample orientation and angle sweeps at fixed $\ensuremath{\nu}/\mathbf{B}.$ We observe series' of resonant absorptions, which we attribute to periodic orbit resonances (POR)\char22{}a phenomenon closely related to cyclotron resonance. The angle dependence of the POR indicates that they are associated with the low-temperature quasi-one-dimensional (Q1D) Fermi surface (FS) of the title compound; indeed, all of the resonance peaks collapse onto a single set of $\ensuremath{\nu}/\mathbf{B}$ versus angle curves, generated using a semiclassical magnetotransport theory for a single Q1D FS. We show that Q1D POR measurements provide one of the most direct methods for determining the Fermi velocity, without any detailed assumptions concerning the band structure; our analysis yields an average value of ${v}_{F}=6.5\ifmmode\times\else\texttimes\fi{}{10}^{4}\mathrm{m}/\mathrm{s}.$ Quantitative analysis of the POR harmonic content indicates that the Q1D FS is strongly corrugated. This is consistent with the assumption that the low-temperature FS derives from a reconstruction of the high-temperature quasi-two-dimensional FS, caused by the CDW instability. Detailed analysis of the angle dependence of the POR yields parameters associated with the CDW superstructure, which are consistent with published results. Finally, we address the issue as to whether or not the interlayer electrodynamics are coherent in the title compound. We obtain a relaxation time from the POR linewidths, which is considerably longer than the interlayer hopping time, indicating that the transport in this direction is coherent.
关于洛泊河苗语关系从句 - 苗语语法笔记（五）
DOI：
--
发表时间：
2019
期刊：
千葉大学ユーラシア言語文化論集
影响因子：
--
作者：
Keiichi Tajima;Mafuyu Kitahara;and Kiyoko Yoneyama;吉本啓;田口善久
通讯作者：
田口善久