Novel phase diagram of superconductor NaxCoO2-yH2O in a 75 % relative humidity

Details Novel phase diagram of superconductor NaxCoO2-yH2O in a 75 % relative humidity Novel phase diagram of superconductor NaxCoO2-yH2O in a 75 % relative humidity

2005-08-08

arxiv.org/abs/cond-mat/0508196v1

J. Phys. Soc. Jpn. 74 (2005) 3147-3150

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures, submitted to Journal of the Physical Society of Japan

Scientific paper

10.1143/JPSJ.74.3147

We succeeded in synthesizing the powder samples of bilayer-hydrate sodium cobalt oxide superconductors NaxCoO2-yH2O with Tc = 0 ~ 4.6 K by systematically changing the keeping duration in a 75 % relative humidity atmosphere after intercalation of water molecules. From the magnetic measurements, we found that the one-day duration sample does not show any superconductivity down to 1.8 K, and that the samples kept for 2 ~ 7 days show superconductivity, in which Tc increases up to 4.6 K with increasing the duration. Tc and the superconducting volume fraction are almost invariant between 7 days and 1month duration. The 59Co NQR spectra indicate a systematic change in the local charge distribution on the CoO2 plane with change in duration.

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