X-ray Absorption and Emission Spectroscopy Study of the Effect of Doping on the Low Energy Electronic Structure of PrFeAsO1-δ
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概要
- 論文の詳細を見る
We report electronic density of states measurements of oxygen vacated PrFeAsO using soft X-ray absorption and emission spectroscopy. The electronic density of states is observed to undergo doping dependent shifts. Oxygen X-ray absorption and emission show long-range intermixing of oxygen $ p$ states. Mean field theory and local density approximations give a good description of the measured oxygen and iron spectra. The near Fermi-level iron spectral weight shows a systematic doping dependence. Concomitant changes in the unoccupied iron-arsenic hybridized spectral features reveal that Fe-As bonding is involved in the process of electron addition near the Fermi-level. By combining x-ray emission and absorption spectra, we observe an increase in the Fe density of states at the Fermi-level as the doping decreases. This doping dependent electronic behavior indicates the possibility of a magnetic instability in the undoped compound. Our data overall imply that PrFeAsO1-δ has weak to intermediate electron correlations.
- Physical Society of Japanの論文
- 2010-07-15
著者
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SHIRAGE Parasharam
National Institute of Advanced Industrial Science and Technology
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Iyo Akira
National Inst. Advanced Industrial Sci. And Technol. (aist) Ibaraki Jpn
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Birgeneau Robert
Department Of Physics And Center For Materials Science And Engineering Massachusetts Institute Of Te
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Liu Yi-sheng
Department of Physics, Tamkang University, Tamsui 250, Taiwan
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Glans Per
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, U.S.A.
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Guo Jinghua
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, U.S.A.
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Shirage Parasharam
National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
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Rotundu Costel
Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, U.S.A.
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Freelon Byron
Department of Physics, University of California, Berkeley, CA 94720, U.S.A.
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Wilson Stephen
Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, U.S.A.
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Chen Jeng-Lung
Department of Physics, Tamkang University, Tamsui 250, Taiwan
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Yang Wanli
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, U.S.A.
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Chang Chunli
Department of Physics, Tamkang University, Tamsui 250, Taiwan
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Birgeneau Robert
Department of Physics, University of California, Berkeley, CA 94720, U.S.A.
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