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Title: Identification of the interstitial Mn site in ferromagnetic (Ga,Mn)As

We determined the lattice location of Mn in ferromagnetic (Ga,Mn)As using the electron emission channeling technique. We show that interstitial Mn occupies the tetrahedral site with As nearest neighbors (T{sub As}) both before and after thermal annealing at 200 °C, whereas the occupancy of the tetrahedral site with Ga nearest neighbors (T{sub Ga}) is negligible. T{sub As} is therefore the energetically favorable site for interstitial Mn in isolated form as well as when forming complexes with substitutional Mn. These results shed new light on the long standing controversy regarding T{sub As} versus T{sub Ga} occupancy of interstitial Mn in (Ga,Mn)As.
Authors:
; ; ; ;  [1] ; ; ;  [2] ; ;  [3] ; ;  [4] ; ; ;  [5] ;  [6]
  1. KU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven (Belgium)
  2. Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, 2686-953 Sacavém (Portugal)
  3. IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Universidade do Porto, 4169-007 Porto (Portugal)
  4. Laboratory of Solid-State Physics and Magnetism, KU Leuven, 3001 Leuven (Belgium)
  5. School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD (United Kingdom)
  6. Centro de Física Nuclear, Universidade de Lisboa, Lisboa 1649-003 (Portugal)
Publication Date:
OSTI Identifier:
22395656
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; CHANNELING; ELECTRON EMISSION; FERROMAGNETIC MATERIALS; FERROMAGNETISM; GALLIUM ARSENIDES; INTERSTITIALS; MANGANESE ARSENIDES; MANGANESE COMPLEXES; VISIBLE RADIATION