Sliding charge density waves in manganites
Sliding charge density waves in manganites
复制标题
锰酸盐中的滑动电荷密度波
DOI：
10.1016/j.jmmm.2009.03.003
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发表时间：
2010
影响因子：
2.7
通讯作者：
G. M. Reisner
中科院分区：
文献类型：
--
作者：
B. Fisher;J. Genossar;L. Patlagan;G. M. Reisner
我们报告了电荷有序 La1−xCaxMnO3（x≈0.5 和 x=0.75）的线性和非线性电导率测量。当冷却到室温以下时，电荷有序化的开始 - Tco 以电阻率对数导数 (dlnρ/d(1/T)) 的峰值和作为温度函数的热电势斜率的变化为标志。通过直流电流和脉冲电流测量具有负电阻系数（x=0.52 和 0.75）的样品的 I-V 特性。我们展示了当使用短的单电流脉冲时，I-V 特性的非线性如何消失。这项工作表明，当在具有负电阻率温度系数的样品中寻找诸如滑动电荷密度波之类的戏剧性现象时，第一步应该是检查在使用单个短电流脉冲时 I-V 非线性是否仍然存在。
We report on the linear and nonlinear conductivity measurements on charge-ordered La1−xCaxMnO3(x≈0.5 and x=0.75). Upon cooling below room temperature, the onset of charge ordering—Tcois marked by a peak in the logarithmic derivative of the resistivity (dlnρ/d(1/T)) and by a change in the slope of the thermopower as a function of temperature. The I–V characteristics of samples with negative coefficient of resistivity (x=0.52 and 0.75) was measured by DC and pulsed currents. We show how the nonlinearity of the I–V characteristics vanishes when short, single current pulses are used. This work shows that when searching for dramatic phenomena such as sliding charge density waves in samples with negative temperature coefficient of resistivity, the first step should be to check if the I–V nonlinearity persists when using single, short current pulses.