| YBa2Cu3Oz超导体的低温稳定相 |
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| 引用本文： | 王强,张孝文,顾秉林,唐晓峰.YBa2Cu3Oz超导体的低温稳定相[J].物理学报,1991,40(6):990-997. |
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| 作者姓名： | 王强 张孝文 顾秉林 唐晓峰 |
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| 作者单位： | (1)清华大学材料科学与工程系,北京,100084; (2)清华大学现代应用物理系,北京,100084 |
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| 摘 要： | 基于8点长方集团变分模型,并引入各向同性最近邻相互作用,以及各向异性次近邻相互作用,计算了YBa2Cu3Oz两Ba层间铜氧平面上□—O系统的有序—无序相变图,不仅在z=7.0附近得到具有超导电性的正交相,并且在z=6.5附近得到具有两倍晶格长度的另一种正交相(正交相Ⅱ)。
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| 关 键 词： | YBaCuO 超导体 低温稳定相 |
| 收稿时间： | 1990-08-20 |
LOW TEMPERATURE STABLE PHASES OF HIGH Tc SUPERCONDUCTOR YBa2Cu3Oz |
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| WANG QIANG,ZHANG XIAO-WEN,GU BING-LIN and TANG XIAO-FENG.LOW TEMPERATURE STABLE PHASES OF HIGH Tc SUPERCONDUCTOR YBa2Cu3Oz[J].Acta Physica Sinica,1991,40(6):990-997. |
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| Authors: | WANG QIANG ZHANG XIAO-WEN GU BING-LIN and TANG XIAO-FENG |
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| Abstract: | Based on eight-point cluster variation method and introduction of isotropic nearest neighbor interaction and anisotropic next nearest neighbor interactions, the orderdisorder phase transition phenomena of the □-O (□: oxygen vacancy; O: oxygen) system on the copper-oxygen plane between two Ba-layers were studied. Calculation results show that there is not only a superconducting orthohombic phase (I) near z = 7.0, but also a superconducting orthohombic phase (II) near z = 6.5, as well as other metastable phases. |
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