TY - JOUR
T1 - Novel Mn-doped chalcopyrites
AU - Sato, K.
AU - Medvedkin, G. A.
AU - Ishibashi, T.
AU - Mitani, S.
AU - Takanashi, K.
AU - Ishida, Y.
AU - Sarma, D. D.
AU - Okabayashi, J.
AU - Fujimori, A.
AU - Kamatani, T.
AU - Akai, H.
PY - 2003/9/1
Y1 - 2003/9/1
N2 - Heavily Mn-doped II-VI-V2 semiconductors, such as CdGeP 2 and ZnGeP2 have been prepared by depositing Mn on single crystalline substrate at nearly 400 °C in an ultra high vacuum chamber. Well-defined ferromagnetic hysteresis with a saturation behavior appears in the magnetization curve up to above room temperature. The chemical states of the ZnGeP2:Mn interface has been clarified by a careful in situ photoemission spectroscopy. The as-prepared surface consists of Ge-rich, metallic Mn compound. In and below the sub-surface region, dilute divalent Mn species as precursors of the DMS phase exist. No MnP phase was observed at any stage of the depth profile. Theoretical band-calculation suggests that the system with vacancies (Cd, Vc, Mn)GeP2 or a non-stoichiometric (Cd, Ge, Mn)GeP2 are ferromagnetic and energetically stable although ferromagnetism is not stable in a stoichiometric compound (Cd, Mn)GeP2.
AB - Heavily Mn-doped II-VI-V2 semiconductors, such as CdGeP 2 and ZnGeP2 have been prepared by depositing Mn on single crystalline substrate at nearly 400 °C in an ultra high vacuum chamber. Well-defined ferromagnetic hysteresis with a saturation behavior appears in the magnetization curve up to above room temperature. The chemical states of the ZnGeP2:Mn interface has been clarified by a careful in situ photoemission spectroscopy. The as-prepared surface consists of Ge-rich, metallic Mn compound. In and below the sub-surface region, dilute divalent Mn species as precursors of the DMS phase exist. No MnP phase was observed at any stage of the depth profile. Theoretical band-calculation suggests that the system with vacancies (Cd, Vc, Mn)GeP2 or a non-stoichiometric (Cd, Ge, Mn)GeP2 are ferromagnetic and energetically stable although ferromagnetism is not stable in a stoichiometric compound (Cd, Mn)GeP2.
KW - C. Ab initio calculation
KW - C. Photoelectron spectroscopy
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U2 - 10.1016/S0022-3697(03)00101-X
DO - 10.1016/S0022-3697(03)00101-X
M3 - Article
AN - SCOPUS:0042784750
VL - 64
SP - 1461
EP - 1468
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
SN - 0022-3697
IS - 9-10
ER -