Impurity Clustering and Ferromagnetic Interactions that are not Carrier-Induced in Dilute Magnetic Semiconductors: The Case of Cu2O:Co

Hannes Raebiger, Stephan Lany, Alex Zunger

Research output: Contribution to journalArticlepeer-review

45 Scopus Citations

Abstract

Current models for ferromagnetism in diluted magnetic semiconductors, such as "p-d exchange" or "double-exchange", rely on the presence of partially filled gap states. We point out a new mechanism, not requiring partially filled states, in which ferromagnetic coupling arises from the occupation of previously unoccupied levels when two transition metal impurities form a close pair. We find from first-principles calculations that this mechanism explains strong ferromagnetic coupling between Co impurities in Cu2O, and at the same time gives rise to Co clustering.

Original languageAmerican English
Article number167203
Number of pages4
JournalPhysical Review Letters
Volume99
Issue number16
DOIs
StatePublished - 18 Oct 2007

NREL Publication Number

  • NREL/JA-590-42139

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