Abstract
In this study, spin transport was directly compared in two types of copper oxides: The first is antiferromagnetic CuO, in which ${\mathrm{Cu}}^{2+}$ has one unpaired spin in the $3d$ orbital; the second is diamagnetic ${\mathrm{Cu}}_{2}\mathrm{O}$ with a ${\mathrm{Cu}}^{+}$ ion having a fully filled $3d$ orbital. The results indicate that CuO exhibits good spin conductivity, whereas ${\mathrm{Cu}}_{2}\mathrm{O}$ is a spin insulator. This indicates that possessing unpaired spins may be an important characteristic of good spin conductors and that copper oxides may have the potential to be spin manipulators.
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