Valence states and electronic structures of Co and Mn substituted spin gapless semiconductor PbPdO2

被引：21

作者：

Kim, D. H. ^{[1
]}

Hwang, Jihoon ^{[1
]}

Lee, Eunsook ^{[1
]}

Lee, K. J. ^{[2
]}

Choo, S. M. ^{[2
]}

Jung, M. H. ^{[2
]}

Baik, J. ^{[3
]}

Shin, H. J. ^{[3
]}

Kim, Bongjae ^{[4
]}

Kim, Kyoo ^{[4
]}

Min, B. I. ^{[4
]}

Kang, J. -S. ^{[1
]}

机构：

[1] Catholic Univ Korea CUK, Dept Phys, Puchon 420743, South Korea

[2] Sogang Univ, Dept Phys, Seoul 121742, South Korea

[3] POSTECH, Pohang Accelerator Lab PAL, Pohang 790784, South Korea

[4] POSTECH, Dept Phys, Pohang 790784, South Korea

来源：

APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 02期

基金：

新加坡国家研究基金会;

关键词：

TRANSITION-METAL COMPOUNDS; ABSORPTION;

D O I：

10.1063/1.4861883

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

页数：4

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