Microwave and millimeter wave spectroscopy in the slightly hole-doped ladders of Sr14Cu24O41
Microwave and millimeter wave spectroscopy in the slightly hole-doped ladders of Sr14Cu24O41
复制标题
Sr14Cu24O41 微孔掺杂阶梯中的微波和毫米波光谱
DOI：
10.1209/epl/i2001-00537-2
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
S. Uchida
中科院分区：
文献类型：
--
作者：
H. Kitano;Ryotaro Inoue;T. Hanaguri;Atsutaka Maeda;N. Motoyama;M. Takaba;K. Kojima;H. Eisaki;S. Uchida
我们测量了Sr14Cu24O41的微波和毫米波电导率σ_1(T，ω)沿梯形(c轴)和腿(a轴)方向的温度和频率依赖关系。在温度T*(∼170K)下，我们观察到σ1c(T，ω)比σ1a(T，ω)具有更强的频率依赖性，在30~100GHz之间形成一个小的共振峰。我们还观察到在低于T*的较低电场下沿c轴的非线性直流电导。这些结果表明，在T*以下，一些集体激发对少量空穴掺杂的Sr14Cu24O41梯子的c轴电荷动力学有贡献。
We have measured the temperature and frequency dependence of the microwave and millimeter wave conductivity σ1(T,ω) along both the ladder (c-axis) and the leg (a-axis) directions in Sr14Cu24O41. Below a temperature T* ( ∼ 170 K), we observed a stronger frequency dependence in σ1c(T,ω) than that in σ1a(T,ω), forming a small resonance peak developed between 30 GHz and 100 GHz. We also observed nonlinear dc conduction along the c-axis at rather low electric fields below T*. These results suggest some collective excitation contributes to the c-axis charge dynamics of the slightly hole-doped ladders of Sr14Cu24O41 below T*.