Quantum size effects on vanadium nanoparticles

Chun Chuen Yang, Wei Luen Huang, Yi Hsin Lin, Chang Yu Weng, Zh Yu Mo, Yang Yuan Chen

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Vanadium nanoparticles of two sizes were fabricated by pulse laser deposition. Transmission electron microscopy (TEM) images revealed that the diameters of the particles two samples were 2.5 and 4 nm. X-ray diffraction was used to determine the purity and lattice constant. Both samples were in the cubic 1-3-m phase. The lattice constants increased with diameter: the 4- and 2.5-nm samples had constants that were 0.42% and 0.55% larger than the lattice constant of the bulk, respectively. Superconductivity behaviors were determined by experiments on magnetic susceptibility. No Meissner effect was observed in the 2.5-nm nanoparticles. The Tc of the 4-nm nanoparticles was about 5.4 K, and accompanied a Hc of about 500 Oe. The critical diameter of vanadium nanoparticles for superconductivity can be estimated using Kubo theory1,2. The calculated critical diameter of the Kubo gap for superconductivity (∼1.6 meV) is about 3 nm. This fact is believed to be the main explanation of the lack of superconductivity in 2.5-nm nanoparticles.

Original languageEnglish
Article number6028244
Pages (from-to)3535-3537
Number of pages3
JournalIEEE Transactions on Magnetics
Volume47
Issue number10
DOIs
StatePublished - Oct 2011

Keywords

  • Critical diameter
  • Kubo gap
  • nano
  • superconductivity

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