Valence states and electronic structures of Co and Mn substituted spin gapless semiconductor PbPdO{sub 2}
- Department of Physics, Sogang University, Seoul 121-742 (Korea, Republic of)
- Pohang Accelerator Laboratory (PAL), POSTECH, Pohang 790-784 (Korea, Republic of)
- Department of Physics, POSTECH, Pohang 790-784 (Korea, Republic of)
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}.
- OSTI ID:
- 22275729
- Journal Information:
- Applied Physics Letters, Vol. 104, Issue 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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