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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Phase separation in the vicinity of quantum-critical doping concentration: Implications for high-temperature superconductors
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Phase separation in the vicinity of quantum-critical doping concentration: Implications for high-temperature superconductors

机译：量子临界掺杂浓度附近的相分离：对高温超导体的影响

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摘要

A general quantitative measure of the tendency towards phase separation is introduced for systems exhibiting phase transitions or crossovers controlled by charge carrier concentration. This measure is devised for the situations when the quantitative knowledge of various contributions to free energy is incomplete, and is applied to evaluate the chances of electronic phase separation associated with the onset of antiferromagnetic correlations in high-temperature cuprate superconductors. The experimental phenomenology of lanthanum- and yittrium-based cuprates was used as input to this analysis. It is also pointed out that Coulomb repulsion between charge carriers separated by the distances of 1-3 lattice periods strengthens the tendency towards phase separation by accelerating the decay of antiferromagnetic correlations with doping. Overall, the present analysis indicates that cuprates are realistically close to the threshold of phase separation-nanoscale-limited in-plane or even macroscopic with charge density varying between adjacent crystal planes.
机译：对于表现出受电荷载流子浓度控制的相变或交叉的系统，引入了对相分离趋势的一般定量度量。该措施是针对各种对自由能的贡献的定量知识不完整的情况而设计的，并用于评估与高温铜酸盐超导体中反铁磁相关性发生相关的电子相分离的机会。基于镧和钇的铜酸盐的实验现象学被用作该分析的输入。还要指出的是，通过加速反铁磁相关性随掺杂的衰减，相隔1-3个晶格周期的电荷载流子之间的库仑斥力会增强相分离的趋势。总的来说，本分析表明，铜酸盐实际上接近相分离-纳米级限制的平面内阈值，甚至接近宏观的阈值，且电荷密度在相邻晶面之间变化。

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