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The Trust Revolution in Schools Pub Date : 2020-05-31 DOI:10.4324/9780429344992-5

J. Davies

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引用次数: 0

摘要

采用动态聚类近似的量子蒙特卡罗方法，研究了含非磁性Zn杂质的二维哈伯德二元对角无序模型。随着锌含量的增加，我们发现d波超导性的强烈抑制伴随着反铁磁自旋涨落的减少。tc随Zn杂质浓度线性消失。自旋磁化率由赝隙转变为类居里-魏斯行为，表明锌掺杂体系中存在自由磁矩。我们在RVB图像中解释这些结果。

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The model:

We study the two-dimensional Hubbard model with nonmagnetic Zn impurities modeled by binary diagonal disorder using Quantum Monte Carlo within the Dynamical Cluster Approximation. With increasing Zn content we ﬁnd a strong suppression of d -wave superconductivity concomitant to a reduction of antiferromagnetic spin ﬂuctuations. T c vanishes linearly with Zn impurity concentration. The spin susceptibility changes from pseudogap to Curie-Weiss like behavior indicating the existence of free magnetic moments in the Zn doped system. We interpret these results within the RVB picture.

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The Trust Revolution in Schools

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