Similarities between Cu and Pu containing “high T_c” superconductors

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• 作者：P. Wachter
• 关键词：Mechanism of high T_c superconductors ; Bose condensation ; Bipolarons
• 刊名：Physica C
• 出版年：2007
• 期刊代码：80_09214534
• 类别：ms
• 出版时间：15 March 2007
• 卷：453
• 期：1-2
• 页码：1-11
• 文件大小：343 K

摘要

PuCoGa₅ has with 18.5 K an extremely high T_c for superconductivity compared with other actinide materials having T_cs around 2–3 K. It appears to be a “high T_c superconductor” in the field of actinides. After nearly 20 years of research in high T_c superconductors, only Cu containing materials have T_cs above about 30 K (exception MgB₂). BCS theory cannot explain such high transition temperatures, thus other or additional coupling mechanisms like magnetic exchange are necessary. Mixed valence, spin holes in an antiferromagnetic lattice, small energy difference between the various valences and two-dimensionality are common features of Cu and Pu containing superconductors. It can be shown in this paper that the mechanism for superconductivity is the same for Cu and Pu containing materials.