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氧缺陷Yba₂Cu₃O_x超导体的局域电子密度和空位浓度与结构转变

LOCAL ELECTRONIC DENSITY, VACANCY CONCENTRATION AND STRUCTURE TRANSITION FOR OXYGEN-DEFICIENT YBa₂Cu₃O_y SUPERCONDUCTORS

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【Author】 Zhang Jincang CCAST(World Laberotary),Beijing, 100080, China and(Department of Physics Henan Normal University Xinxiang 453002)Cao Shixun; Liu Junzheng1); Cheng Guosheng Dai Xianqi and Liu Fengqi(Department of Physics, Mnalysis and Test enter Henan Norm

【机构】河南师范大学物理系；

【摘要】研究了氧缺陷ＹＢａ２Ｃｕ３Ｏｘ（ｘ＝６．３３－６．９４）超导体在３００Ｋ和７７Ｋ下的正电子寿命谱，利用两态捕获模型计算了局域电子密度ｎｅ和空位浓度Ｃｖ的变化，发现了存在于由氧缺陷导致正交—四方结构转变区域的异常变化和结构不稳定性，讨论了相应的正电子湮没特征以及与超导电性之间的关联．更多还原

【Abstract】 Abstract We present the positron lifetime data for oxygen-deficient YBa2Cu3Ox (x= 6. 33 - 6. 94)superconducting systems at 300K and 77K respectively. It is gaven that the local electron density:n and vacancy concentration Cv changes as oxygen content x. It is found that there are the anomalous change at x=6. 5±0. 1 which may could correspond the O-T phase transition and structural instability, which these results would prove further that y(123) supercductor is a orthorhombic structure system with vacancy type defects更多还原