Inverse magnetic proximity effects in superconducting In-Ni and Sn-Ni nanoparticle assemblies

Chun Ming Wu, Sunil K. Karna, Shih Bin Liu, Chi Hung Lee, Chin Wei Wang, Wen Hsien Li

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We report on experimental evidence of non-s-wave pairing in In and Sn nanoparticle assemblies. The superconducting transition temperature T C of the In and Sn nanoparticles varies noticeably with the particle diameter. Surprisingly, T C shifts to a noticeably higher temperature when magnetic Ni nanoparticles are introduced into the vicinity of the superconducting nanoparticles. The T C increases further when the magnetic Ni nanoparticles are brought even closer to the superconducting nanoparticles. There is a critical Ni composition and a critical spatial separation between the magnetic and superconducting nanoparticles that must be reached before their magnetic proximity will suppress the superconductivity. A qualitative mechanism is proposed to understand the present observations.

Original languageEnglish
Article number1691
JournalJournal of Nanoparticle Research
Volume15
Issue number6
DOIs
StatePublished - Jun 2013

Keywords

  • In nanoparticles
  • Magnetic proximity effect
  • Sn nanoparticle
  • Superconductivity

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