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|Title: ||Anisotropic nature of Superconductivity in hexagonal rubidium tungsten bronzes Rb0.23WO3+δ|
|Authors: ||Ting, L.C.;Pan, J. J.;Liao, T. W.;Hsieh, H. H.;錢凡之;Chien, F. Z.;Hor, P. H.;林大欽;Ling, D. C.|
|Issue Date: ||2009-12-31 10:58:29 (UTC+8)|
|Abstract: ||Low-field M(H), transport, and magnetization measurements have been performed on hexagonal rubidium tungsten bronze Rb0.23WO(subscript 3+δ). Various thermodynamic parameters, such as H(subscript c1)(0), H(subscript c2)(0), λ(subscript ab)(0),λ(subscript c)(0), ξ(0), anisotropy parameterτ, and Ginzburg-Landau parameterκ are reported. The irreversibility line H(subscript irr)(T) follows (1-T/Tc)(superscript 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 T(subscript c) collapse onto a universal curve 4πM/(TH)β=F[A((TT(subscript c)(H))/(TH)β)]with exponent β=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 Rb0.23WO(subscript 3+δ).|
|Relation: ||Chinese Journal of Physics=中國物理學刊 45(2-II)，頁237-243|
|Appears in Collections:||[物理學系暨研究所] 期刊論文|
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