Phonon density of states in MgB2 -: art. no. 017005

被引：184
|
作者：
Osborn, R
Goremychkin, EA
Kolesnikov, AI
Hinks, DG
机构：
[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
[2] Argonne Natl Lab, Div Intense Pulsed Neutron Source, Argonne, IL 60439 USA
来源：
PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 01期
关键词：
D O I：
10.1103/PhysRevLett.87.017005
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report inelastic neutron scattering measurements of the phonon density of states in (MgB2)-B-11, which has a superconducting transition at 39.2 K. The acoustic phonons extend in energy to 36 meV, and there are highly dispersive optic branches peaking at 54, 78, 89, and 97 meV. A simple Born-von Karman model reproduces the mode energies, and provides an estimate of the electron-phonon coupling of lambda similar to 0.9. Furthermore, the estimated boron and magnesium contributions to the isotope effect art: in qualitative agreement with experiment. The data confirm that a conventional phonon mechanism, with moderately strong electron-phonon coupling, can explain the observed superconductivity.
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页码：1 / 017005
页数：4
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