Angle-Resolved Photoemission Analysis of Electronic Structures for Thermoelectric Properties of Off-Stoichiometric Fe<sub>2–x</sub>V<sub>1+x</sub>Al Alloys
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- Soda Kazuo
- Department of Quantum Engineering, Graduate School of Engineering, Nagoya University Synchrotron Radiation Research Center, Nagoya University
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- Harada Shota
- Department of Quantum Engineering, Graduate School of Engineering, Nagoya University
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- Hayashi Toshimitsu
- Department of Quantum Engineering, Graduate School of Engineering, Nagoya University
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- Kato Masahiko
- Department of Quantum Engineering, Graduate School of Engineering, Nagoya University
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- Ishikawa Fumihiro
- Department of Physics, Faculty of Science, Niigata University
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- Yamada Yuh
- Department of Physics, Faculty of Science, Niigata University
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- Fujimori Shin-ichi
- Quantum Beam Science Center, Japan Atomic Energy Agency
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- Saitoh Yuji
- Quantum Beam Science Center, Japan Atomic Energy Agency
Bibliographic Information
- Other Title
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- Angle-Resolved Photoemission Analysis of Electronic Structures for Thermoelectric Properties of Off-Stoichiometric Fe₂₋xV₁₊xAl Alloys
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Abstract
The electronic states of Heusler (L21)-type off-stoichiometric Fe2–xV1+xAl alloys have been investigated by soft x-ray angle-resolved photoelectron spectroscopy (ARPES) to clarify the origin of the remarkable increase in thermoelectric power, which cannot be explained by the rigid-band model. In off-normal and normal ARPES, Fe2.05V0.95Al shows weakly dispersive bulk bands from the binding energy of 0.3 eV at the Γ point in the Γ–X and Γ–L directions, and an almost dispersionless one around 0.3 eV in the gap of dispersive bulk bands in the Γ–L direction, which is attributed to antisite Fe defects. At the Γ point, the bulk bands do not appear to cross the Fermi level EF, which is consistent with the rigid-band model for excess Fe content, but no band crossing EF is found at the X point. The antisite Fe defect states near EF might push up the band at the X point and cause p-type thermoelectric properties, which is unexpected for the rigid-band model. The change in electronic structures and thermoelectric properties for the off-stoichiometry and substitution by a forth element is discussed.
Journal
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 57 (7), 1040-1044, 2016
The Japan Institute of Metals and Materials
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Details 詳細情報について
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- CRID
- 1390282679231505920
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- NII Article ID
- 130005158396
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- NII Book ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL BIB ID
- 027448174
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed