Observations of large magnetic moments in icosahedral Pb nanoparticles

Sunil K. Karna, Chi Yen Li, Chun Ming Wu, Chien Kang Hsu, Chin Wei Wang, Wen Hsien Li

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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.

Original languageEnglish
Pages (from-to)8906-8910
Number of pages5
JournalJournal of Physical Chemistry C
Volume115
Issue number18
DOIs
StatePublished - 12 May 2011

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