Stripes disorder and correlation lengths in doped antiferromagnets
Stripes disorder and correlation lengths in doped antiferromagnets
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掺杂反铁磁体中的条纹无序和相关长度
DOI：
10.1103/physrevb.62.13836
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发表时间：
1999
影响因子：
3.7
通讯作者：
O. Zachar
中科院分区：
文献类型：
--
作者：
O. Zachar
对于掺杂反铁磁体中的条纹，我们发现自旋和电荷相关长度之比 $\xi_{s}/\xi_{c}$ 为确定系统中无序的主要形式提供了明确的标准。如果条纹无序由拓扑缺陷控制，则 $\xi_{s}/\xi_{c}\lesssim 1$。相反，如果条纹相关性主要由非拓扑弹性变形（即布拉格-格拉斯类型的无序）造成无序，则预期为 $1<\xi _{s}/\xi_{c}\lesssim 4$。因此，在 $(LaNd)_{2-x}Sr_{x}CuO_{4}$ 中观察到 $\xi _{s}/\xi_{c}\approx 4$ 和 $La_{2/3}Sr_{1/3}NiO_{4}$ 中 $\xi_{s}/\xi _{c}\approx 3$ 总是意味着条纹处于布拉格玻璃型状态，拓扑缺陷的相关性远不如通常假设的那么重要。讨论了预期的光谱特性。因此，我们为这些材料中实验观察到的玻璃态的任何理论分析奠定了基础。
For stripes in doped antiferromagnets, we find that the ratio of spin and charge correlation lenghts, $\xi_{s}/\xi_{c}$, provide a sharp criterion for determining the dominant form of disorder in the system. If stripes disorder is controlled by topological defects then $\xi_{s}/\xi_{c}\lesssim 1$. In contast, if stripes correlations are disordered primarily by non-topological elastic deformations (i.e., a Bragg-Glass type of disorder) then $1<\xi _{s}/\xi_{c}\lesssim 4$ is expected. Therefore, the observation of $\xi _{s}/\xi_{c}\approx 4$ in $(LaNd)_{2-x}Sr_{x}CuO_{4}$ and $\xi_{s}/\xi _{c}\approx 3$ in $La_{2/3}Sr_{1/3}NiO_{4}$ invariably implies that the stripes are in a Bragg glass type state, and topological defects are much less relevant than commonly assumed. Expected spectral properties are discussed. Thus, we establish the basis for any theoretical analysis of the experimentally obsereved glassy state in these material.