Title: Electron-electron interaction effect and resistivity maximum in nanocrystalline and ordered superconducting γ-Mo₂N

Authors: R.S. Ningthoujam, N.S. Gajbhiye

Addresses: Chemistry Department, Indian Institute of Technology Kanpur, Kanpur 208 016, India; Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India. ' Chemistry Department, Indian Institute of Technology Kanpur, Kanpur 208 016, India

Abstract: Nanocrystalline superconducting γ-Mo₂N phase is prepared by a chemical route, which crystallises in cubic structure with the space group, Pm3m. The crystallite size is found to be 18 nm. It shows the superconducting to normal transition temperature at 3.8 K. The resistivity behaviour is investigated to understand the effects of disorder and non-stoichiometry. At lower temperature, it shows the resistivity minimum at 30 K, which is interpreted by the electron-electron interaction effect attributed to disorder. At higher temperature, a broad maximum in resistivity curve in the temperature range 265-275 K is found.

Keywords: nanocrystalline; superconducting; resistivity minimum; molybdenum nitride; gamma-Mo2N; disorder; non-stoichiometry; nanotechnology; electron-electron interaction.

DOI: 10.1504/IJNT.2010.034699

International Journal of Nanotechnology, 2010 Vol.7 No.9/10/11/12, pp.932 - 944

Published online: 17 Aug 2010 *

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