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Study of temperature dependent atomic correlations in MgB2

  • Solid and Condensed State Physics
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Abstract.

We have studied temperature evolution of the local as well as the average crystal structure of MgB2 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.

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Authors and Affiliations

  1. Istituto di Cristallografia, CNR, sezione di Monterotondo, Area della Ricerca di Roma - Montelibretti, P.O. Box 10, 00016, Monterotondo St., Italy

    G. Campi

  2. Istituto dei Sistemi Complessi, CNR-INFM, v. dei Taurini 19, 00185, Roma, Italy

    E. Cappelluti

  3. Dipartimento di Fisica, Università di Roma “La Sapienza”, P. le Aldo Moro 2, 00185, Roma, Italy

    E. Cappelluti, S. Agrestini, N. L. Saini & A. Bianconi

  4. Lujan Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA

    Th. Proffen

  5. Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan, 48824, USA

    X. Qiu, E. S. Bozin & S. J.L. Billinge

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  1. G. Campi
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  2. E. Cappelluti
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  3. Th. Proffen
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  4. X. Qiu
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  5. E. S. Bozin
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  6. S. J.L. Billinge
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  7. S. Agrestini
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  8. N. L. Saini
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  9. A. Bianconi
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Correspondence to G. Campi.

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Campi, G., Cappelluti, E., Proffen, T. et al. Study of temperature dependent atomic correlations in MgB2 . Eur. Phys. J. B 52, 15–21 (2006). https://doi.org/10.1140/epjb/e2006-00269-7

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  • DOI: https://doi.org/10.1140/epjb/e2006-00269-7

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