Study of temperature dependent atomic correlations in MgB 2

G. Campi (), E. Cappelluti, Th. Proffen, X. Qiu, E. S. Bozin, S. J.L. Billinge, S. Agrestini, N. L. Saini and A. Bianconi

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 52, issue 1, 15-21

Abstract: We have studied temperature evolution of the local as well as the average crystal structure of MgB 2 using real-space atomic pair distribution function (PDF) measured by high resolution neutron powder diffraction in a wide temperature range of T=10–600 K. We find small positive correlation factors for the B–B and B–Mg pairs, determined by mean-square displacements (MSD) and the mean-square relative displacements (MSRD). We analyze the PDF using both Einstein and force constant models finding a good agreement between the experimental data and the two models. This indicates that B and Mg atomic correlations are not sensitive to the details of phonon dispersion. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Keywords: 61.12.-q Neutron diffraction and scattering, 63.20.-e Phonons in crystal lattices, 74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.), (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2006-00269-7

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