Unusually large magnetic moments in the normal state and superconducting state of Sn nanoparticles

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

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3 Scopus citations

Abstract

We report on the observations of spontaneous magnetic moments in the normal as well as in the superconducting states of a 9 nm Sn nanoparticle assembly, through X-ray diffraction, magnetization, ac magnetic susceptibility, and neutron diffraction measurements. The saturation magnetization reaches an unexpectedly large value of 1.04 emu/g at 5 K, with a temperature profile that can be described by Bloch's law with an exponent of b = 1.8. A magnetic moment of 〈μZ〉 = 0.38 μB develops after cooling from 260 to 4 K. Superconductivity develops below TC = 3.98 K, which is 7 % higher than the TC = 3.72 K of bulk Sn. Surprisingly, an addition magnetic moment of 〈μZ〉 = 0.05 μB develops upon entering the superconducting state.

Original languageEnglish
Article number1905
JournalJournal of Nanoparticle Research
Volume15
Issue number9
DOIs
StatePublished - Sep 2013

Keywords

  • Ferromagnetism
  • Sn nanoparticle
  • Superconductivity

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