Observations of Large Magnetic Moments in Icosahedral Pb Nanoparticles

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题名:	Observations of Large Magnetic Moments in Icosahedral Pb Nanoparticles
作者:	Karna,SK;Li,CY;Wu,CM;Hsu,CK;Wang,CW;Li,WH
贡献者:	物理學系
关键词:	ELECTRON-DIFFRACTION;PERMANENT MAGNETISM;CLUSTERS;PARTICLES;TRANSITION;METALS;AU
日期:	2011
上传时间:	2012-06-11 10:51:06 (UTC+8)
出版者:	國立中央大學
摘要:	We report on the observation of a large magnetic moment in 7 nm icosahedral Pb particles. This moment is 140 times stronger than that developed in 6 nm fcc Pb particles. The saturation magnetization of 7 nm icosahedral Pb particles exhibits a peak at 40 K, which is reduced by only 9% when the temperature is increased from 40 to 300 K. No sign of the occurrence of superconductivity is observed in 7 nm icosahedral Pb particles upon cooling to 1.8 K, whereas superconductivity develops below 6.6 K in 6 nm fcc Pb particles. It is the icosahedral atomic arrangement that generates the large magnetic moment and suppresses the development of superconductivity in these nanoparticles.
關聯:	JOURNAL OF PHYSICAL CHEMISTRY C
显示于类别:	[物理學系] 期刊論文

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