Journal
APPLIED PHYSICS LETTERS
Volume 104, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4861883
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Funding
- NRF [2011-0022444, 2011-0025237, 2009-0079947, 2012R1A1A2039944]
- KISTI supercomputing center [KSC-2012-C2-27]
- MSIP
- PAL of Korea
- National Research Foundation of Korea [2011-0022444, 2012R1A1A2039944] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Electronic structures of Pb(Pd0.9T0.1)O-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 (similar to 2.7) and tetravalent, respectively. The measured valence-band PES and O 1s XAS spectra show that both PbPdO2 and PbPd0.9Co0.1O2 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 PbPd0.9Mn0.1O2. (C) 2014 AIP Publishing LLC.
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