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題 名 | Anisotropic Nature of Superconductivity in Hexagonal Rubidium Tungsten Bronze Rb□WO□ |
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作 者 | Ting, L. C.; Pan, J. J.; Liao, T. W.; Hsieh, H. H.; Chien, F. Z.; Hor, P. H.; Ling, D. C.; | 書刊名 | Chinese Journal of Physics |
卷 期 | 45:2(2) 2007.04[民96.04] |
頁 次 | 頁237-243 |
分類號 | 337.473 |
關鍵詞 | |
語 文 | 英文(English) |
英文摘要 | Low-field M(H), transport, and magnetization measurements have been performed on hexagonal rubidium tungsten bronze Rb₀.₂₃WO₃+δ. Various thermodynamic parameters, such as Hc₁ (0), Hc₂ (0), λab(0), λc(0), ξ(0), anisotropy parameter γ, and Ginzburg-Landau parameter κ are reported. The irreversibility line Hirr(T) follows (1- T/Tc) ⁿ with exponent n = 1.51 for sample with δ ~ -0.10 and 2.11 for sample with δ ~ 0.02, indicating that the vortex dimensionality of Rb₀.₂₃WO₂.₉₀ is anisotropic three-dimensional (3D) and that of Rb₀.₂₃WO₃.₀₂ is quasi two-dimensional (2D). In addition, the magnetization curves in high-field regime near Tc collapse onto a universal curve ₄πM/(TH)□ =F[A((T-Tc(H))/(TH)β]with exponentβ= 2/3 for sample with δ ~ -0.10 and 1/2 for sample with δ ~ 0.02, indicative of an anisotropic 3D and a quasi-2D scaling behavior for Rb₀.₂₃WO₂.₉₀ and Rb₀.₂₃WO₃.₀₂, respectively. The observed results strongly suggest that oxygen content has a significant influence on the nature of the superconducting properties of Rb₀.₂₃WO₃+δ. |
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