Thermal Conductivity of Ce Doped Bi-2212 Superconductors |
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作者姓名: | LIBo WUBai-Mei M.Ausloos |
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作者单位: | [1]StructuralResearchLaboratory,DepartmentofPhysics,UniversityofScienceandTechnologyofChina,Hefei230026 [2]SUPRATECS,B5,UniversitedeLiege,B-4000Liege,Belgium |
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摘 要: | The temperature dependence of the thermal conductivity in Bi2Sr2 Ca1-xCexCu2Oy x = 0.1, 0.2, 0.3, 0.4 is presented. With increasing Ce-doping level, the thermal conductivity peak under Tc is suppressed then disappears,while another peak appears at low temperatures for the non-superconducting compounds. The numerical analysis shows that the thermal conductivity peak under Tc can be well described by the normal electron relaxation-time contribution model, and the phonon-induced thermal conductivity peak could be well described within the Debye approximation of the phonon spectrum. The existence and velriation of these two thermal conductivity peaks indicate the adjustability between the superconducting and insulating components in the samples with different Ce-doping levels.
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关 键 词: | 铋-2212超导体 热传导率 铈掺杂 德拜近似 |
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