Novel Mn-doped chalcopyrites

Sato, K and Medvedkin, GA and Ishibashi, T and Mitani, S and Takanashi, K and Ishida, Y and Sarma, DD and Okabayashi, J and Fujimori, A and Kamatani, T and Akai, H (2003) Novel Mn-doped chalcopyrites. In: Journal of Physics and Chemistry of Solids, 64 (9-10). pp. 1461-1468.

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Abstract

Heavily Mn-doped II-VI-V-2 semiconductors, such as CdGeP2 and ZnGeP2 have been prepared by depositing Mn on single crystalline substrate at nearly 400 T 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 ZDGeP(2):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, V-c, 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. (C) 2003 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	Journal of Physics and Chemistry of Solids
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	C.Photoelectron spectroscopy;C. Ab initio calculation
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	25 Aug 2011 09:38
Last Modified:	17 Oct 2018 07:07
URI:	http://eprints.iisc.ac.in/id/eprint/40151

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