Abstract

We report on the results of experiments indicating the existence of spin glass in beryllium-doped GaAs–AlGaAs quantum wells with a virtual Anderson transition. We have observed experimentally a slow relaxation of resistance after the application of a magnetic field and the magnetization curve hysteresis. The formation of spin glass is associated with indirect exchange of spins of localized holes via delocalized states in the region of the virtual Anderson transition. It is shown that an isotropic negative magnetoresistance observed in these structures can also be associated with spin glass properties.

中文翻译：

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具有虚拟安德森跃迁的 GaAs-AlGaAs 量子阱中的自旋玻璃和各向同性负磁阻

摘要

我们报告了实验结果，表明在具有虚拟安德森跃迁的铍掺杂 GaAs-AlGaAs 量子阱中存在自旋玻璃。我们已经通过实验观察到在施加磁场和磁化曲线滞后后电阻的缓慢弛豫。自旋玻璃的形成与通过虚拟安德森跃迁区域中的离域状态间接交换局部空穴的自旋有关。结果表明，在这些结构中观察到的各向同性负磁阻也与自旋玻璃特性有关。