Study of temperature dependent atomic correlations in MgB2

被引：28

作者：

Campi, G.

Cappelluti, E.

Proffen, Th.

Qiu, X.

Bozin, E. S.

Billinge, S. J. L.

Agrestini, S.

Saini, N. L.

Bianconi, A.

机构：

[1] CNR, Ist Cristallog, Sez Monterotondo, Area Ric Roma Montelibretti, I-00016 Monterotondo, RM, Italy

[2] CNR, INFM, Ist Sistemi Complessi, I-00185 Rome, Italy

[3] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[4] Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr, Los Alamos, NM 87545 USA

[5] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

来源：

EUROPEAN PHYSICAL JOURNAL B | 2006年 / 52卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1140/epjb/e2006-00269-7

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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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收藏

页码：15 / 21

页数：7

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