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xiaoyue1199木虫 (著名写手)
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【资源】【分享】中科大陈仙辉小组在铁基超导体领域获重要进展 (已搜索无重复)
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中科大陈仙辉小组在铁基超导体领域获重要进展 相关论文发表于5月7日的《自然》 中国科大微尺度物质科学国家实验室的陈仙辉课题组近日在铁基超导体研究领域又取得重要进展。研究表明，探寻晶格与自旋自由度之间的相互作用对理解高温超导电性机理是非常重要的。该成果发表在5月7日出版的《自然》杂志上（Nature 459，64(2009).）。上述研究工作是与中国科大国家同步辐射国家实验室的吴自玉合作完成的。 原文摘要部分报道： http://www.nature.com/nature/jou ... ll/nature07981.html |
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kaixing004
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amannnn(金币+2,VIP+0):谢谢斑竹 5-10 12:22
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amannnn(金币+2,VIP+0):谢谢斑竹 5-10 12:22
纳米镍粉(金币+36,VIP+0):过节费,多去议事厅 5-29 00:07
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A large iron isotope effect in SmFeAsO1 - xFx and Ba1 - xKxFe2As2 R. H. Liu1, T. Wu1, G. Wu1, H. Chen1, X. F. Wang1, Y. L. Xie1, J. J. Ying1, Y. J. Yan1, Q. J. Li1, B. C. Shi1, W. S. Chu2,3, Z. Y. Wu2,3 & X. H. Chen1 Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, China Correspondence to: X. H. Chen1 Correspondence and requests for materials should be addressed to X.H.C. (Email: chenxh@ustc.edu.cn). Top of page Abstract The recent discovery of superconductivity in oxypnictides with a critical transition temperature (TC) higher than the McMillan limit of 39 K (the theoretical maximum predicted by Bardeen–Cooper–Schrieffer theory) has generated great excitement1,2,3,4,5. Theoretical calculations indicate that the electron–phonon interaction is not strong enough to give rise to such high transition temperatures6, but strong ferromagnetic/antiferromagnetic fluctuations have been proposed to be responsible7,8,9. Superconductivity and magnetism in pnictide superconductors, however, show a strong sensitivity to the crystal lattice, suggesting the possibility of unconventional electron–phonon coupling. Here we report the effect of oxygen and iron isotope substitution on TC and the spin-density wave (SDW) transition temperature (TSDW) in the SmFeAsO1 - xFx and Ba1 - xKxFe2As2 systems. The oxygen isotope effect on TC and TSDW is very small, while the iron isotope exponent  C = -dlnTC/dlnM is about 0.35 (0.5 corresponds to the full isotope effect). Surprisingly, the iron isotope exchange shows the same effect on TSDW as TC. This indicates that electron–phonon interaction plays some role in the superconducting mechanism, but a simple electron–phonon coupling mechanism seems unlikely because a strong magnon–phonon coupling is included. |
4楼2009-05-10 08:36:12