在10Hz至13MHz频率范围内,我们对蓝青铜Tl0.3MoO3单晶在电荷密度波态不同温度下的复电导进行了系统的研究.在非共振区,Tl0.3MoO3单晶的电导行为与Ramanujachary等人所报道的相一致.但是在低频区所观察到共振现象的特征钉扎频率比该小组所报道的小一个量级,而与K0.3MoO3具有相同的量级.通过加上一个Drude项,利用谐振子模型拟合实验数据,我们得到了单粒子能隙,电子的有效质量及凝聚电子的密度.由此可以导出在低频区只有1.3×1013cm-3的凝聚电子对电导有贡献,我们认为这是一种由弱钉扎机制导致的低频共振现象.
Complex conductivity of Tl0.3MoO3 was measured from 10 Hz to 13MHz at several temperatures in the charge-density-wave state. In non-resonance region,the conductivity is similar to those reported by Ramanujachary in the same material.The resonant behavior was observed in the low frequency range. The observed characteristic pinning frequencies have the same order as that of K0.3MoO3, but one order smaller than that of Tl0.3MoO3 reported by another group. The experimental data is described in terms of a harmonic oscillator model with a Drude term. The single particle gap, the effective mass and the concentration of condensed electrons are evaluated from the fit equations.The analyses show that only small part, about 1.3×1013cm-1 condensed electrons contribute to the conductivity in the low frequency range. This observed low frequency resonance is assumed to correspond to weak pinning centers.
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