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

Journal Article · Mon Jan 13 04:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4861883· OSTI ID:22275729

Kim, D. H.; Hwang, Jihoon; Lee, Eunsook; Lee, K. J.; Choo, S. M.; Jung, M. H. ^[1]; Baik, J.; Shin, H. J. ^[2]; Kim, Bongjae; Kim, Kyoo; Min, B. I. ^[3]

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1. Department of Physics, Sogang University, Seoul 121-742 (Korea, Republic of)
2. Pohang Accelerator Laboratory (PAL), POSTECH, Pohang 790-784 (Korea, Republic of)
3. 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, Journal Name: Applied Physics Letters Journal Issue: 2 Vol. 104; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
DENSITY FUNCTIONAL METHOD
MANGANESE
PALLADIUM
PHOTOEMISSION
SEMICONDUCTOR MATERIALS
SPIN
X-RAY SPECTROSCOPY