Abstract
Electron-electron interactions in Anderson-localized states lead to both ferromagnetic (direct exchange) and antiferromagnetic (kinetic-type exchange) interactions among spins of singly occupied states. Specific heat anomaly, in particular its magnetic field dependence, and magnetic susceptibility at low temperatures are calculated by taking into account the coexistence of ferromagnetic and antiferromagnetic interactions among localized spins within a pair model. It is shown that the experimental results on Si:P can be well explained by the present theory.
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