Abstract
The absence of a Mn local moment was observed in Mn-doped amorphous silicon films. The magnetic susceptibility obeys the Curie-Weiss law for a wide range of ( up to 0.175) but with extremely small moment. Magnetization measurements suggest that this behavior occurs because only a small percentage of Mn ( states with ) contribute to the magnetization. Thus, the magnetic moments are quenched for the majority of Mn atoms, contrary to the general belief of the existence of a localized Mn moment in Si. X-ray absorption spectroscopy suggests that the quenching of Mn moments is attributed to the formation of an itinerant but Anderson-localized impurity band, forming at as low as .
- Received 22 October 2007
DOI:https://doi.org/10.1103/PhysRevB.77.073306
©2008 American Physical Society