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Title: Valence states and electronic structures of Co and Mn substituted spin gapless semiconductor PbPdO{sub 2}

Electronic structures of Pb(Pd{sub 0.9}T{sub 0.1})O{sub 2} (T = Mn, Co) spin gapless semiconductors have been investigated by employing soft X-ray absorption spectroscopy (XAS) and photoemission spectroscopy (PES). The valence states of Co and Mn ions are found to be mixed-valent (∼2.7) and tetravalent, respectively. The measured valence-band PES and O 1s XAS spectra show that both PbPdO{sub 2} and PbPd{sub 0.9}Co{sub 0.1}O{sub 2} are small-gap semiconductors. This finding is supported by the calculated band structures, obtained in the density functional theory with the modified Becke-Johnson potential (mBJ) scheme. This work also shows evidence for the existence of the phase separation in Mn-substituted PbPd{sub 0.9}Mn{sub 0.1}O{sub 2}.
Authors:
; ; ;  [1] ; ; ;  [2] ; ;  [3] ; ; ;  [4]
  1. Department of Physics, The Catholic University of Korea (CUK), Bucheon 420-743 (Korea, Republic of)
  2. Department of Physics, Sogang University, Seoul 121-742 (Korea, Republic of)
  3. Pohang Accelerator Laboratory (PAL), POSTECH, Pohang 790-784 (Korea, Republic of)
  4. Department of Physics, POSTECH, Pohang 790-784 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22275729
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; DENSITY FUNCTIONAL METHOD; MANGANESE; PALLADIUM; PHOTOEMISSION; SEMICONDUCTOR MATERIALS; SPIN; X-RAY SPECTROSCOPY