Novel Phase Diagram of Superconductor Na<sub><i>x</i></sub>CoO<sub>2</sub>·<i>y</i>H<sub>2</sub>O in 75% Relative Humidity
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- Ohta Hiroto
- Department of Chemistry, Graduate School of Science, Kyoto University
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- Michioka Chishiro
- Department of Chemistry, Graduate School of Science, Kyoto University
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- Itoh Yutaka
- Department of Chemistry, Graduate School of Science, Kyoto University
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- Yoshimura Kazuyoshi
- Department of Chemistry, Graduate School of Science, Kyoto University
書誌事項
- タイトル別名
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- Novel Phase Diagram of Superconductor NaxCoO2 yH2O in 75% Relative Humidity
- Novel Phase Diagram of Superconductor NaxCoO2 yH2O in 75パーセント Relative Humidity
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説明
We succeeded in synthesizing powder samples of bilayer hydrate sodium cobalt oxide superconductors NaxCoO2·yH2O with Tc=0–4.6 K by systematically changing the duration in a 75% relative humidity atmosphere after intercalation of water molecules. From magnetic measurements, we found that a sample kept for one day in the atmosphere does not show any superconductivity down to 1.8 K, and that samples kept for 2–7 days show superconductivity, in which Tc increases up to 4.6 K with increasing duration. Tc and the superconducting volume fraction are almost invariant between 7-day and 1-month durations. The 59Co nuclear quadrupole resonance (NQR) spectra indicate a systematic change in the local charge distribution on the CoO2 plane with a change in duration.
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 (12), 3147-3150, 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
- 1390282679163753600
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- NII論文ID
- 210000105766
- 110002975232
- 130004539088
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- NII書誌ID
- AA00704814
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- BIBCODE
- 2005JPSJ...74.3147O
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- ISSN
- 13474073
- 00319015
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- NDL書誌ID
- 7740935
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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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- 抄録ライセンスフラグ
- 使用不可