Unconventional Upper- and Lower-Critical Fields and Normal-State Magnetic Susceptibility of the Novel Superconducting Compound $N{a}_{0.35}Co{O}_2\cdot 1.3H_{2}O$

Abstract

Magnetic properties of the novel layered superconductor, Na${}_{0.35}$CoO${}_2$$\cdot$1.3H${}_2$O have been investigated. From the temperature dependence and field dependence of the magnetization, the superconducting transition temperature, as well as upper- and lower-critical fields have been estimated to be $T_C=4.6$ K, $H_{C2}(0)=61.0$ T and $H_{C1}(0)=28.1$ Oe. These values give quite unusual phenomenological parameters, \textit{i.e.}, coherent length, penetration depth and Ginzburg-Landau parameter of $\xi =2.32$ nm, $\lambda =5.68\times 10^3$ Å and $\kappa \equiv \lambda /\xi =244$, suggesting an unconventional nature of superconductivity. Normal-state magnetic susceptibility shows an upturn below 130 K, which is confirmed to be inherent by high-field magnetization data. The upturn may have relevance to the mechanism of the superconductivity.

4 pages, 4figures. Submitted to Phys. Rev. Lett

References in corpus (2)

• An Electronic Model for $Co{O}_2$ layer based systems: Chiral RVB metal and Superconductivity
• Transport properties and electronic states of the thermoelectric oxide NaCo_2O_4

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