Upper critical field of aligned Na_{x}(H_{3}O)_{z}CoO_{2}\cdot yH_{2}O superconductor by magnetization measurement

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dc.creatorRen, Zhi
dc.creatorFeng, Chunmu
dc.creatorXu, Zhu'an
dc.creatorFang, Minghu
dc.creatorCao, Guanghan
dc.date2007-08-31
dc.date.accessioned2026-07-07T08:33:58Z
dc.date.available2026-07-07T08:33:58Z
dc.descriptionWe present magnetization measurements for the upper critical field $H_{c2}$ on aligned Na$_{x}$(H$_{3}$O)$_{z}$CoO$_{2}\cdot y$H$_{2}$O superconductors with magnetic field parallel to CoO$_2$ layers. The temperature-dependent part of the normal-state magnetization $M(H,T)$ can be well scaled with Brillouin function, suggesting the existence of impurity moments. By subtracting the contribution of the magnetic impurity moments, a well defined onset of superconducting diamagnetism allows the in-field superconducting transition temperature $T_{c}$($H$) accurately determined. No superconducting transition was observed down to 1.9 K under an applied field of 8 Tesla. The result suggests that the $H^{\|ab}_{c2}(0)$ value is just within the Pauli paramagnetic limit, supporting spin-singlet superconductivity in the cobalt oxyhydrate superconductor. Additionally, the upward curvature near $T_{c}$ in the $H^{\|ab}_{c2}-T$ phase diagram was confirmed to be intrinsic. Possible origin of the anomaly was discussed.
dc.description4 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0708.4256
dc.identifierhttp://arxiv.org/abs/0708.4256
dc.identifierPHYSICAL REVIEW B 76, 132501 (2007)
dc.identifierdoi:10.1103/PhysRevB.76.132501
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/139275
dc.subjectSuperconductivity
dc.titleUpper critical field of aligned Na_{x}(H_{3}O)_{z}CoO_{2}\cdot yH_{2}O superconductor by magnetization measurement
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