Inelastic x-ray scattering study of collective electron excitations in MgB2 -: art. no. 060504

被引：20

作者：

Galambosi, S ^{[1
]}

Soininen, JA

Mattila, A

Huotari, S

Manninen, S

Vankó, G

Zhigadlo, ND

Karpinski, J

Hämäläinen, K

机构：

[1] Univ Helsinki, Dept Phys Sci, Div Xray Phys, FIN-00014 Helsinki, Finland

[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[3] ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW B | 2005年 / 71卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.71.060504

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report an experimental inelastic x-ray scattering study of the collective electron excitations in MgB2, Single-crystal and polycrystalline samples were used to study the free-electron-like (similar to 20 eV) plasmon and the recently theoretically predicted low energy (similar to 3 eV) plasmon mode.. We present the energy-loss spectra for several momentum transfer values and find that the excitations exhibit a strong directional dependence. We discuss the dispersion of collective excitations and find a good agreement between the experimental results and the published theoretical calculations. Some discrepancies between the experimental data and the calculations were observed, namely slightly differing excitation energies and momentum-transfer dependence. However, these discrepancies are the same order of magnitude as the uncertainties within the various computational methods.

引用

页数：4

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