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


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
Issue number10
StatePublished - Oct 2011


  • Critical diameter
  • Kubo gap
  • nano
  • superconductivity


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