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New Hg-Containing High-T, Superconductors: (Pb,Hg)(Sr,La)2CuO5-δ(1201-type) and (Pb,Hg)Sr2(Ca,Y)Cu2O7-δ(1212-type)
並列摘要
Bulk superconductivity has been achieved in the Hg-containing cuprates of (Pb0.5Hg0.5)(Sr2-xLax)CuO5-δ (1201~type) and (Pb0.5Hg0.5)Sr2(Ca1-xYx)Cu2O7-δ(1212-type) which exhibit Tc's around 30 K and 90 K for x = 1.2 in the 1201 system and x = 0.3 in the 1212 system, respectively. The detailed chemical compositions and crystal structures of such newly discovered IIg-containing superconducting phases have been studied by X-ray diffraction (XRD) including the Rietveld refinement analysis. The disorder of the hole reservoir layer (Pb,Hg)O was found by the analysis. The chemical substitutions of La^3+ into the Sr^2+ sites in the 1201 system and Ca^2+ into the Y^3+ sites in the 1212 system lead to optimise the hole concentration in the conducting CuO2 planes and enhance superconducting transition temperature.
並列關鍵字
無資料延伸閱讀
- Chang, C. W., Lin, J. G., Chang, C. Y., Liu, R. S., & Huang, C. Y. (1998). Thermoelectric Power Studies on the CuO2 Plane Contributions of (Y1-xCax) Ba2Cu3O6.1 and (Pbo.5Cd0.5)Sr2(Y1-xCax)Cu2O7. Chinese Journal of Physics, 36(2S), 360-364. https://www.airitilibrary.com/Article/Detail?DocID=05779073-199804-201211010025-201211010025-360-364
- Liu, R. S., Wu, S. F., Shy, D. S., Tai, C. H., Hu, S. F., & Jefferson, D. A. (1993). Remarkably High Tc and Jc in the (T1,Pb,Bi)(Sr,Ba)2Ca2Cu3O9 System and Its Application in Superconducting Tapes. Chinese Journal of Physics, 31(6S), 951-959. https://www.airitilibrary.com/Article/Detail?DocID=05779073-199312-201212270032-201212270032-951-959
- Lee, W. C., & Jeong, M. J. (1996). Upper Critical Fields Hc2 and Penetration Depths λ of YBa2Cu3-xZnxO7-δ Single Crystals. Chinese Journal of Physics, 34(2S), 509-513. https://www.airitilibrary.com/Article/Detail?DocID=05779073-199604-201212030010-201212030010-509-513
- Chang, I. C., Liu, J. Z., Lan, M. D., Klavins, P., & Shelton, R. N. (1996). Superconducting Properties of the System Tl1-xHgxBa2Ca2Cu3O8+δ. Chinese Journal of Physics, 34(2S), 497-504. https://www.airitilibrary.com/Article/Detail?DocID=05779073-199604-201212030010-201212030010-497-504
- Hwang, G. H., Shi, J. B., & Ku, H. C. (1989). Superconductivity Enhancement in the Bi, (Sr2-x Lax)CuO6-δ, System. Chinese Journal of Physics, 27(4), 273-280. https://www.airitilibrary.com/Article/Detail?DocID=05779073-198908-201303150001-201303150001-273-280