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We have studied the electronic structure of hexagonal MnAs, as epitaxialcontinuous film on GaAs(001) and as nanocrystals embedded in GaAs, by Mn 2pcore-level photoemission spectroscopy. Configuration-interaction analyses basedon a cluster model show that the ground state of the embedded MnAs nanocrystalsis dominated by a d5 configuration that maximizes the local Mn moment.Nanoscaling and strain significantly alter the properties of MnAs. Internalstrain in the nanocrystals results in reduced p-d hybridization and enhancedionic character of the Mn-As bonding interactions. The spatial confinement andreduced p-d hybridization in the nanocrystals lead to enhanced d-electronlocalization, triggering d-d electron correlations and enhancing local Mnmoments. These changes in the electronic structure of MnAs have an advantageouseffect on the Curie temperature of the nanocrystals, which is measured to beremarkably higher than that of bulk MnAs.

Enhanced electron correlations, local moments, and Curie temperature in strained MnAs nanocrystals embedded in GaAs