Unconventional Upper- and Lower-Critical Fields and Normal-State Magnetic Susceptibility of the Novel Superconducting Compound $Na_{0.35} Co O_2 \cdot 1.3 H_2O$

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dc.creatorSakurai, Hiroya
dc.creatorTakada, Kazunori
dc.creatorYoshii, Shunsuke
dc.creatorSasaki, Takayoshi
dc.creatorKindo, Koichi
dc.creatorTakayama-Muromachi, Eiji
dc.date2003-04-23
dc.date.accessioned2026-07-07T02:50:55Z
dc.date.available2026-07-07T02:50:55Z
dc.descriptionMagnetic 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 $ξ=2.32$ nm, $λ=5.68\times 10^{3}$ Å and $κ\equivλ/ξ=244$, 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.
dc.description4 pages, 4figures. Submitted to Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/cond-mat/0304503
dc.identifierhttp://arxiv.org/abs/cond-mat/0304503
dc.identifierdoi:10.1103/PhysRevB.68.132507
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/21273
dc.subjectSuperconductivity
dc.titleUnconventional Upper- and Lower-Critical Fields and Normal-State Magnetic Susceptibility of the Novel Superconducting Compound $Na_{0.35} Co O_2 \cdot 1.3 H_2O$
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