Novel Phase Diagram of Superconductor NaxCoO2 yH2O in 75% Relative Humidity

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  • Ohta Hiroto
    Department of Chemistry, Graduate School of Science, Kyoto University
  • Michioka Chishiro
    Department of Chemistry, Graduate School of Science, Kyoto University
  • Itoh Yutaka
    Department of Chemistry, Graduate School of Science, Kyoto University
  • Yoshimura Kazuyoshi
    Department of Chemistry, Graduate School of Science, Kyoto University

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  • Novel Phase Diagram of Superconductor NaxCoO2 yH2O in 75パーセント Relative Humidity
  • 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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Abstract

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.

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