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

Moreno, M., Cerdá, J. I., Ploog, K. H., & Horn, K. (2010). Enhanced electron correlations, local moments, and Curie temperature in strained MnAs nanocrystals embedded in GaAs. Physical review / B, 82: 045117. doi:10.1103/PhysRevB.82.045117.

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 Creators:
Moreno, M.1, Author
Cerdá, J. I1, Author
Ploog, K. H.2, Author
Horn, Karsten3, Author           
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1Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, E-28049 Madrid, Spain, ou_persistent22              
2Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, D-10117 Berlin, Germany, ou_persistent22              
3Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              

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 Abstract: We have studied the electronic structure of hexagonal MnAs, as epitaxial continuous film on GaAs(001) and as nanocrystals embedded in GaAs, by Mn 2p core-level photoemission spectroscopy. Configuration-interaction analyses based on a cluster model show that the ground state of the embedded MnAs nanocrystals is dominated by a d5 configuration that maximizes the local Mn moment. Nanoscaling and strain significantly alter the properties of MnAs. Internal strain in the nanocrystals results in reduced p-d hybridization and enhanced ionic character of the Mn-As bonding interactions. The spatial confinement and reduced p-d hybridization in the nanocrystals lead to enhanced d-electron localization, triggering d-d electron correlations, and enhancing local Mn moments. These changes in the electronic structure of MnAs have an advantageous effect on the Curie temperature of the nanocrystals, which is measured to be remarkably higher than that of bulk MnAs.

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Language(s): eng - English
 Dates: 2010-01-052009-10-092010-07-20
 Publication Status: Published in print
 Pages: 11
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 Rev. Type: Peer
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Title: Physical review / B
Source Genre: Journal
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Publ. Info: Woodbury, NY : Published by the American Physical Society through the American Institute of Physics
Pages: - Volume / Issue: 82 Sequence Number: 045117 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008