Evolution of the physical properties with Na content in the cobalt oxide superconductors NaxCoO2 center dot 1.3H(2)O

K Matano
GQ Zheng
J Cmaidalka
Y Sun
RL Meng
CW Chu

We report measurements on the cobalt oxide superconductors NaxCoO2 (.) 1.3H(2)O over a wide Na content range x = 0.25-0.34, using X-ray diffraction, susceptibility and Co-59 nuclear quadrupole resonance (NQR) techniques. We find that T, increases with decreasing x but reaches to a plateau for x <= 0.28, which correlates closely with the NQR frequency that measures the occupancy of the Co 3d-orbitals. (c) 2006 Elsevier B.V. All rights reserved.

Physica B: Condensed Matter

ELSEVIER SCIENCE BV

378-380

871

872

10.1016/j.physb.2006.01.480

https://doi.org/10.1016/j.physb.2006.01.480
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