In situ Photoemission Study of the Room Temperature Ferromagnet ZnGeP2Mn

Phys. Rev. Lett. 91, 107202 – Published 5 September 2003
Y. Ishida, D. D. Sarma, K. Okazaki, J. Okabayashi, J. I. Hwang, H. Ott, A. Fujimori, G. A. Medvedkin, T. Ishibashi, and K. Sato

Abstract

The chemical states of the ZnGeP2Mn interface which shows ferromagnetism above room temperature have been studied by photoemission spectroscopy. Mn deposition on the ZnGeP2 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 3d electrons changed their character from itinerant to localized along the depth, and in the deep region, dilute divalent Mn species (<5% Mn) was observed with a coexisting metallic Fermi edge of non-Mn 3d character. The possibility of hole doping through Mn substitution for Ge and/or Zn vacancy is discussed.

DOI: http://dx.doi.org/10.1103/PhysRevLett.91.107202

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  • Received 20 March 2003
  • Published 5 September 2003

© 2003 The American Physical Society

Authors & Affiliations

Y. Ishida1, D. D. Sarma2,3, K. Okazaki1, J. Okabayashi1, J. I. Hwang3, H. Ott4, A. Fujimori1,3, G. A. Medvedkin5, T. Ishibashi5, and K. Sato5

  • 1Department of Physics, University of Tokyo, Bunkyo-ku Tokyo 113-0033, Japan
  • 2Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
  • 3Department of Complexity Science, University of Tokyo, Bunkyo-ku Tokyo 113-0033, Japan
  • 4Institut für Experimentalphysik Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
  • 5Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan

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