Magnetic susceptibility study of hydrated and non-hydrated NaxCoO2-yH2O single crystals

Abstract

We have measured the magnetic susceptibility of single crystal samples of non-hydrated NaxCoO2 (x ~ 0.75, 0.67, 0.5, and 0.3) and hydrated Na0.3CoO2-yH2O (y ~ 0, 0.6, 1.3). Our measurements reveal considerable anisotropy between the susceptibilities with H||c and H||ab. The derived anisotropic g-factor ratio (g_ab/g_c) decreases significantly as the composition is changed from the Curie-Weiss metal with x = 0.75 to the paramagnetic metal with x = 0.3. Fully hydrated Na0.3CoO2-1.3H2O samples have a larger susceptibility than non-hydrated Na0.3CoO2 samples, as well as a higher degree of anisotropy. In addition, the fully hydrated compound contains a small additional fraction of anisotropic localized spins.

arXiv comment6 pages, 5 figures

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Cited by in corpus (19)

• Neutron scattering study of novel magnetic order in Na0.5CoO2
• Na Induced Correlations in Na${}_x$CoO${}_2$
• Searching for Stable Na-ordered Phases in Single Crystal Samples of gamma-NaxCoO2
• Electronic Correlations in CoO2, the Parent Compound of Triangular Cobaltates
• Spin-Dynamics in the Carrier-Doped $S=1/2$ Triangular-Lattice of Na${}_x$CoO${}_2$-yH${}_2$O
• 59Co-NMR Knight Shift of Aligned Crystals and Polycrystalline Samples of Superconducting Na0.3CoO2.1.3H2O
• Anomalous electronic Raman scattering in Na_xCoO_2 H_2O
• Elliptical hole pockets in the Fermi surfaces of unhydrated and hydrated sodium cobalt oxides
• Investigation of the Spin Density Wave in NaxCoO2
• Magnetic properties of superconducting cobalt oxides NaxCoO2.yH2O
• Sodium Trimer Ordering on NaxCoO2 Surface
• Spin-entropy contribution to thermopower in the [Ca${}_2$CoO${}_{3-t}$]${}_{0.62}$(CoO${}_2$) misfits
• Non-monotonic temperature dependence of thermopower in strongly correlated electron systems
• The origin of a${}_{1g}$ and e${}_g$' orderings in Na${}_x$CoO${}_2$
• Hydration-induced anisotropic spin fluctuations in Na_{x}CoO_{2}\cdot1.3H_{2}O superconductor
• Phonon scattering and stability of Na_0.5CoO_2
• Revisiting the crystal electric field of P2-NaxCoO2 for the intermediate spin state of Co3+
• Upper critical field of aligned Na_{x}(H_{3}O)_{z}CoO_{2}\cdot yH_{2}O superconductor by magnetization measurement
• Possibility of an unconventional spin state of Ir${}^{4+}$ in Ba${}_{21}$Ir${}_9$O${}_{43}$ single crystal