Direct observation of charge re-distribution in a MgB2 superconductor

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题名:	Direct observation of charge re-distribution in a MgB2 superconductor
作者:	楊仲準;Wu, Sheng Yun;Shih, Po-Hsun;Ji, Jhong-Yi;Chan, Ting-Shan;Yang, Chun Chuen
贡献者:	理學院物理學系
关键词:	negative thermal expansion;superconductivity;two-phonon effect
日期:	2016-02-22
上传时间:	2026-04-23 11:51:41 (UTC+8)
出版者:	IOP Publishing Ltd.;IOP Publishing
摘要:	摘要： To study the origin of negative thermal expansion effects near the superconducting transition temperature TC in MgB2, low-temperature high-energy synchrotron radiation x-ray diffraction was used to probe the charge redistribution near the boron atoms. Our results reveal that the in-plane hole-distribution of B− hops through the direct orbital overlap of Mg2+ along the c-axis at 50 K and is re-distributed out-of-plane. This study shows that the out-of-plane π-hole distribution plays a dominant role in the possible origin of superconductivity and negative thermal effects in MgB2. 其他題名： SUST 其他題名： Supercond. Sci. Technol 出版者： IOP Publishing 出版日期： 2016-02-22 出處： Superconductor science & technology, 2016-02, Vol.29 (4) 資源來源： Institute of Physics Journals 版權： 2016 IOP Publishing Ltd 識別號： ISSN: 0953-2048 識別號： EISSN: 1361-6668 識別號： DOI: 10.1088/0953-2048/29/4/045001 識別號： CODEN: SUSTEF
显示于类别:	[物理學系] 期刊論文

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