Universal conductance fluctuations as a probe of chaotic behavior in mesoscopic metallic spin glasses

We study the conductance fluctuations in mesoscopic metallic spin glasses with Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions at low temperatures. It is found that the conductance of the system is sensitive to the configurations of the spins in the system. As a result, the chaotic nature of spin reorganizations, as temperature is varied, manifests itself in the form of measurable conductance fluctuations. Thermal-conductance fluctuations at a fixed temperature are shown also to be directly related to the corresponding thermal spin fluctuations.