Origin of Weak Pseudogap Behaviors in Na<sub>0.35</sub>CoO<sub>2</sub>: Absence of Small Hole Pockets
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- Yada Keiji
- Department of Physics, Nagoya University
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- Kontani Hiroshi
- Department of Physics, Nagoya University
書誌事項
- タイトル別名
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- Origin of Weak Pseudogap Behaviors in Na0.35CoO2: Absence of Small Hole Pockets
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抄録
We analyze the normal electronic states of Na0.35CoO2 based on the effective d–p model with a full d-orbital freedom using the fluctuation-exchange (FLEX) approximation. The electronic states sensitively depend on the topology of Fermi surfaces, which changes with the crystalline electric splitting (CES) due to the trigonal deformation. We succeed in reproducing the weak pseudogap behaviors in the density of states (DOS) and in the uniform magnetic susceptibility below 300 K, assuming that six small hole pockets predicted by LDA band calculations are absent. If these pockets exist, on the contrary, “anti-pseudogap behaviors” should inevitably appear. Thus, the present study strongly supports the absence of the small hole pockets in Na0.35CoO2, as reported by recent ARPES measurements. A large Fermi surface around the Γ-point would account for the superconductivity in water-intercalated samples.
収録刊行物
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 74 (8), 2161-2164, 2005
一般社団法人 日本物理学会
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詳細情報 詳細情報について
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- CRID
- 1390282679164686336
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- NII論文ID
- 210000105570
- 110001979681
- 130004539369
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- NII書誌ID
- AA00704814
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- BIBCODE
- 2005JPSJ...74.2161Y
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- ISSN
- 13474073
- 00319015
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- NDL書誌ID
- 7393787
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- CiNii Articles
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- 使用不可