Superconducting Properties under Magnetic Field in Na$_{0.35}$CoO$_{2}{\cdot}1.3$H$_{2}$O Single Crystal

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dc.creatorSasaki, Takahiko
dc.creatorBadica, Petre
dc.creatorYoneyama, Naoki
dc.creatorYamada, Kazuyoshi
dc.creatorTogano, Kazumasa
dc.creatorKobayashi, Norio
dc.date2004-02-13
dc.date.accessioned2026-07-25T23:02:04Z
dc.descriptionWe report the in-plane resistivity and magnetic susceptibility of the layered cobalt oxide Na$_{0.35}$CoO$_{2}{\cdot}1.3$H$_{2}$O single crystal. The temperature dependence of the resistivity shows metallic behavior from room temperature to the superconducting transition temperature $T_{c}$ of 4.5 K. Sharp resistive transition, zero resistivity and almost perfect superconducting volume fraction below $T_{c}$ indicate the good quality and the bulk superconductivity of the single crystal. The upper critical field $H_{c2}$ and the coherence length $ξ$ are obtained from the resistive transitions in magnetic field parallel to the c-axis and the $ab$-plane. The anisotropy of $ξ$, $ξ_{ab} / ξ_{c} =$ 12 nm/1.3 nm $\simeq$ 9.2, suggests that this material is considered to be an anisotropic three dimensional superconductor. In the field parallel to the $ab$-plane, $H_{c2}$ seems to be suppressed to the value of Pauli paramagnetic limit. It may indicate the spin singlet superconductivity in the cobalt oxide.
dc.description4 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0402355
dc.identifierhttp://arxiv.org/abs/cond-mat/0402355
dc.identifierJ. Phys. Soc. Jpn. 73, 1131 (2004)
dc.identifierdoi:10.1143/JPSJ.73.1131
dc.identifier.urihttps://dspace.dare.co.zw/handle/123456789/94850
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleSuperconducting Properties under Magnetic Field in Na$_{0.35}$CoO$_{2}{\cdot}1.3$H$_{2}$O Single Crystal
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