Observations of Large Magnetic Moments in Icosahedral Pb Nanoparticles

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/52944

Title:	Observations of Large Magnetic Moments in Icosahedral Pb Nanoparticles
Authors:	Karna,SK;Li,CY;Wu,CM;Hsu,CK;Wang,CW;Li,WH
Contributors:	物理學系
Keywords:	ELECTRON-DIFFRACTION;PERMANENT MAGNETISM;CLUSTERS;PARTICLES;TRANSITION;METALS;AU
Date:	2011
Issue Date:	2012-06-11 10:51:06 (UTC+8)
Publisher:	國立中央大學
Abstract:	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.
Relation:	JOURNAL OF PHYSICAL CHEMISTRY C
Appears in Collections:	[Department of Physics] journal & Dissertation

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