新型超导体MgB2和MgCNi3热、电输运性质研究

来源 :物理学报 | 被引量 : 0次 | 上传用户：dpf443398

【摘要】

：

报道了两种新型超导体MgB2,MgCNi3和氧化物高温超导体Bi2Sr2Ca0.9Ce0.1Cu2O8+y的热导率-温度关系和电阻率-温度关系.实验发现氧化物高温超导体在进入超导态后热导有所上升,出

【作者】

：

吴柏枚李波杨东升郑卫华李世燕曹烈兆陈仙辉

【机构】

：

中国科学技术大学结构分析开放实验室

【出处】

：

物理学报

【发表日期】

：

2004年期

【关键词】

：

热导率超导体 MgB2 MgCNi3

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报道了两种新型超导体MgB2,MgCNi3和氧化物高温超导体Bi2Sr2Ca0.9Ce0.1Cu2O8+y的热导率-温度关系和电阻率-温度关系.实验发现氧化物高温超导体在进入超导态后热导有所上升,出现极大值后再下降,而MgB2和MgCNi3则单调下降.由Wiedemann-Franz定律分别计算了它们在正常态的电子热导和声子热导.由于共有化电子的非局域性,在MgB2和MgCNi3中电子热导的贡献占据相当大的成分.对电子热导的分析结果表明,在MgB2和MgCNi3的电子热导中静态缺陷对电子的散射占主导地位.

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新型超导体MgB2和MgCNi3热、电输运性质研究

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