Valence and Na content dependences of superconductivity in NaxCoO2.yH2O

Details Valence and Na content dependences of superconductivity in NaxCoO2.yH2O Valence and Na content dependences of superconductivity in NaxCoO2.yH2O

2005-11-17

arxiv.org/abs/cond-mat/0511416v1

Physics

Condensed Matter

Superconductivity

4 figures and 1 table

Scientific paper

10.1103/PhysRevB.74.092502

Various samples of sodium cobalt oxyhydrate with relatively large amounts of Na$^{+}$ ions were synthesized by a modified soft-chemical process in which a NaOH aqueous solution was added in the final step of the procedure. From these samples, a superconducting phase diagram was determined for a section of a cobalt valence of $\sim$+3.48, which was compared with a previously obtained one of $\sim$+3.40. The superconductivity was significantly affected by the isovalent exchanger of Na$^{+}$ and H$_{3}$O$^{+}$, rather than by variation of Co valence, suggesting the presence of multiple kinds of Fermi surface. Furthermore, the high-field magnetic susceptibility measurements for one sample up to 30 T indicated an upper critical field much higher than the Pauli limit supporting the validity of the spin-triplet pairing mechanism.

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