Effect of Ag Addition on the Surface Topography and the Vibrational Dynamics of MgB2

Dinesh Kumar, Muralidhar Miryala, M. S.Ramachandra Rao, Masato Murakami

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Abstract

We fabricated MgB2 samples with Ag additions using in situ solid-state reaction via a single-step sintering to study the effect of Ag on the structural, vibration, and superconducting properties of MgB2 samples. Ag addition to MgB2 resulted in a significant improvement in Jc although no appreciable effect was observed in the lattice parameters and the superconducting transition temperature Tc. Dramatic increase in the grain size was observed with Ag addition and topographic measurements with atomic force microscopy revealed the formation of Ag–Mg nanoparticles 5–20 nm in size at 2 and 4 wt% Ag additions. The fact that these samples showed high Jc values suggests that the nanoparticles formed as a result of Ag addition are responsible for enhanced flux pinning. Raman spectroscopy measurements showed that Ag additions also increased disorder in the system and thereby affected the line width of the Raman active E2g mode.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalJournal of Superconductivity and Novel Magnetism
DOIs
Publication statusAccepted/In press - 2017 Dec 9

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Keywords

  • Ag-added MgB
  • Atomic Force Microscopy (AFM)
  • Critical current density (J)
  • Raman spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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