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Advances in Materials Science and Engineering
Volume 2013 (2013), Article ID 247393, 3 pages
http://dx.doi.org/10.1155/2013/247393
Research Article

Calculated Changes in the Elastic Properties of MgCNi3 at the Superconducting Transition

School of Applied Physics, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

Received 29 November 2012; Accepted 8 January 2013

Academic Editor: Mark Blamire

Copyright © 2013 R. Abd-Shukor. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We calculated the elastic properties of MgCNi3 at the superconducting transition ( ) using various thermodynamic and acoustic data. From the calculations, a step discontinuity of 8 ppm in the bulk modulus, 7 ppm in the Young’s modulus, and 3 ppm in the longitudinal sound velocity ( ) is expected at . The step discontinuities at the transition temperature indicated the importance of lattice changes to the superconducting mechanism of MgCNi3. The Debye temperature was calculated to be 460 K. The electron-phonon coupling constants calculated in the weak and strong coupling limits of the BCS theory and the van Hove scenario showed that MgCNi3 is a moderately strong coupled superconductor.