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双能隙超导体MgB2的热导
引用本文:杨东升,吴柏枚,李波,郑卫华,李世燕,樊荣,陈仙辉,曹烈兆.双能隙超导体MgB2的热导[J].物理学报,2003,52(3):683-686.
作者姓名:杨东升  吴柏枚  李波  郑卫华  李世燕  樊荣  陈仙辉  曹烈兆
作者单位:中国科学技术大学结构分析开放实验室,物理系,合肥 230026
基金项目:国家自然科学基金(批准号:10174070)和国家重点基础研究专项基金(批准号:G19990646)资助的课题.
摘    要:测量了多晶MgB2的热导,实验温区为5—300K.在双能隙模型下,用基于BCS超导理论的BRT热导理论对实验结果进行了分析,给出MgB2中两个能隙大小分别为16和51meV.对电子热导的分析结果表明σ能带准粒子受到的杂质散射远小于π能带准粒子受到的杂质散射.与单晶MgB2的热导实验结果相比,多晶MgB2的声子热导结果表明在c方向上热传导声子受到来自σ能带准粒子的散射,显示了MgB2在能量输运上的各向异性. 关键词: MgB2 热导率 能隙

关 键 词:MgB2  热导率  能隙
收稿时间:2002-06-10
修稿时间:7/9/2002 12:00:00 AM

Thermal conductivity of two-energy-gap superconductor MgB2
Yang Dong-Sheng,Wu Bai-Mei,Li Bo,Zheng Wei-Hu,Li Shi-Yan,Fan Rong,Chen Xian-Hui and Cao Lie-Zhao.Thermal conductivity of two-energy-gap superconductor MgB2[J].Acta Physica Sinica,2003,52(3):683-686.
Authors:Yang Dong-Sheng  Wu Bai-Mei  Li Bo  Zheng Wei-Hu  Li Shi-Yan  Fan Rong  Chen Xian-Hui and Cao Lie-Zhao
Abstract:We present in this paper the thermal conductivity of the superconductor MgB2 between 5—300 K. The temperature dependence of the thermal conductivity can be fitted with the BRT thermal conductivity method by a phenomenological two-gap model. The sizes of the two energy gaps are 16 and 51meV. The analysis about electronic thermal conductivity indicates that the σ-band impurity scattering rate is small relative to the π-band scattering rate. In contrast to the single-crystal sample, our result indicates that the scattering of phonons from the σ-band quasi-particles exist in the c-axial direction heat transport of a polycrystalline sample. This result demonstrates the anisotropic energy transport in MgB2.
Keywords:MgB2  thermal conductivity  energy gap
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