The chemical states of the interface which shows ferromagnetism above room temperature have been studied by photoemission spectroscopy. Mn deposition on the substrate heated to 400 °C induced Mn substitution for Zn and then the formation of metallic Mn-Ge-P compounds. Depth profile studies have shown that Mn electrons changed their character from itinerant to localized along the depth, and in the deep region, dilute divalent Mn species ( Mn) was observed with a coexisting metallic Fermi edge of non-Mn character. The possibility of hole doping through Mn substitution for Ge and/or Zn vacancy is discussed.
- Received 20 March 2003
- Published 5 September 2003
© 2003 The American Physical Society