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首页> 外文期刊>Physical review >Formation of magnetic moments and resistance upturn at grain boundaries of two-dimensional electron systems
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Formation of magnetic moments and resistance upturn at grain boundaries of two-dimensional electron systems

机译：二维电子系统晶界处磁矩的形成和电阻上倾

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摘要

Electronic correlations control the normal state of bulk high-T_c cuprates. Strong correlations also suppress the charge transport through cuprate grain boundaries (GBs). The question then arises if these correlations can produce magnetic states at cuprate GBs. We analyze the formation of local magnetic moments at the GB of a correlated two-dimensional electron system, which is represented by an inhomogeneous Hubbard model. The model Hamiltonian is diagonalized after the implementation of a mean-field decoupling. The formation of local magnetic moments is supported by a sufficiently strong variance in the bond kinetic energies at the GB. Local scattering potentials can assist or suppress the formation of a magnetic GB state, depending on the details of their spacial distribution. Grain-boundary-induced stripes are formed in the vicinity the GB and decay into the bulk. Moreover, we observe the buildup of conducting channels which are confined by magnetic clusters. The grain boundary resistance increases at decreasing temperatures. This low-temperature behavior is caused by the suppression of current correlations in the state with local magnetic GB moments. The resistance upturn at low temperatures is in qualitative agreement with experiments.
机译：电子关联控制大量高T_c铜酸盐的正常状态。强相关性还抑制了电荷通过铜酸盐晶界（GB）的传输。那么，是否存在这些相关性可以在铜酸盐GBs处产生磁态的问题。我们分析了相关二维电子系统的GB处的局部磁矩的形成，该二维电子系统由不均匀的Hubbard模型表示。实施均场去耦后，哈密顿量模型被对角化。 GB处键动能的足够强的变化支持了局部磁矩的形成。取决于其空间分布的细节，局部散射电势可以辅助或抑制磁性GB状态的形成。晶粒边界诱发的条纹在GB附近形成并衰减为块状。此外，我们观察到由磁簇限制的传导通道的建立。温度降低，晶界电阻增加。这种低温行为是由于在局部磁GB力矩的状态下电流相关性受到抑制而引起的。低温下的电阻上升与实验定性一致。

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